On Friday,there were new demands for Iran to follow Security Council resolutions to halt nuclear enrichment.

VOA: special.2009.09.26

This was very successful and it was an enrichment.

这个实验很成功,也是一次改进。

麻省理工公开课 - 媒体、教育、市场课程节选

I do a program called "BRYTE", which is Brown Refugee Youth Tutoring Enrichment,

我参加的一个项目叫“BRYTE”，是布朗青年难民辅导计划的简称，

校园生活 - SpeakingMax英语口语达人

Iran's primary nuclear enrichment facility in Natanz has continued to operate since 2007, despite sanctions by UN Security Council.

VOA: standard.2009.10.24

Iran has not given a clear response to a U.N.proposal to send uranium to Russia and France for enrichment.

VOA: standard.2009.11.16

Iran disclosed the underground uranium enrichment facility this week, when it found out western intelligence agencies had information on the plant.

VOA: standard.2009.09.25

However,Iranian President Mahmoud Ahmadinejad said earlier this week that Iran will not stop the enrichment drive, and considers the matter closed.

VOA: standard.2009.09.11

That deal would commit Iran to shipping about 75 percent of its lightly enriched stockpile of uranium to Russia for further enrichment.

VOA: standard.2009.10.21

According to reports, the deal would have Russia taking in partially enriched Iranian uranium for further enrichment.

VOA: standard.2009.10.19

French Foreign Minister Bernard Kouchner rejected Iran's latest move on its uranium-enrichment efforts as a diplomatic "pirouette."

VOA: standard.2010.01.04

In April,the P5+1 offered Iran a revised package of incentives for it to halt uranium enrichment and return to negotiations over its nuclear program.

VOA: standard.2009.09.11

The plan calls for Iran to send uranium abroad for enrichment, but Tehran countered with conditions to what was presented as a take-it-or-leave-it proposition.

VOA: standard.2009.11.15

"Last September,the world learned that Iran had secretly built another uranium-enrichment facility at Qom, in clear violation of Security Council resolutions and Iran's IAEA obligations."

VOA: standard.2010.06.09

Officials say the Vienna talks will focus on possibly sending Iran's uranium overseas for enrichment.

VOA: standard.2009.10.04

President Obama says the revelation that Iran is building a second nuclear enrichment facility, and tried to hide it for years, shows Tehran's true intentions.

VOA: standard.2009.09.25

The plan follows months of deadlock over Iran's nuclear program and the recent discovery of a previously unknown nuclear-enrichment plant near the Iranian city of Qom.

VOA: standard.2009.10.19

Republicans and Democrats expressed identical concerns that by engaging in negotiations, Iran may be playing for time in an effort to move ahead with weapons-related enrichment.

VOA: standard.2009.10.28

Uranium enrichment is the process used to make fuel for nuclear power plants, but when extended it can also produce fissile material for an atomic bomb.

VOA: standard.2009.11.28

U.S.officials say Iran's uranium enrichment program is weapons-related, despite Tehran's expression of peaceful intent.

VOA: standard.2010.05.14

We are not going to suspend the completion of the Fordoo nuclear enrichment activities.

VOA: standard.2009.11.28

The North also said it had reached the final stage of a uranium enrichment program, possibly creating a second process by which it can build nuclear arms.

VOA: standard.2009.09.06

(Speech) Pasechnik says there are political of continuing instability involving the enrichment question.

VOA: standard.2009.11.16

(Sound) Iran's English-language Press TV reports that International Atomic Energy Agency inspectors are beginning a three-day visit to Iran,Saturday, to examine the country's Fordoo nuclear enrichment facility.

VOA: standard.2009.10.24

Iran says its uranium-enrichment program is designed only for electricity generating purposes, and has allowed U.N.inspectors to visit a previously secret processing facility near the city of Qom.

VOA: standard.2009.10.28

Friday's IAEA resolution criticized Tehran for building the secret nuclear enrichment plant at Fordoo, which it disclosed in September, and demanded that it cease construction on the plant immediately.

VOA: standard.2009.11.28

a critical meeting with Iran's nuclear negotiator on October 1 to determine if Iran is prepared to discuss an end to a uranium enrichment program believed to be weapons-related.

VOA: standard.2009.09.23

The fact that if Tehran surrendered most of the uranium it has been processing at its Natanz enrichment facility it would ease worries that its effort is weapons related.

VOA: standard.2009.10.24

"We are not going to suspend our enrichment activities.

VOA: standard.2009.11.28

Berman says the legislation would be only one point of pressure on Iran to roll back its uranium-enrichment program, which the United States believes is aimed at producing a nuclear weapon.

VOA: standard.2009.10.28

The threshold for weapons is 90 percent enrichment."

VOA: standard.2009.10.19