He says there are more than three hundred thousand small objects or pieces of debris in orbit that are larger than one centimeter.

VOA: special.2009.04.01

They evolve to become very dense, hard, pustular lesions, which are filled with what turns out to be tissue debris.

它们逐渐变成粘稠,发硬,产生脓包状的伤痕,而这些粘稠的脓事实上是组织残骸

耶鲁公开课 - 生物医学工程探索课程节选

And so that debris fills up a little spot that would feel, according to reports, because again we don't see it now, feels like a little pellet underneath your skin.

然后这些死亡细胞都填充在一个点上,会有一种,根据记录所说,因为我们,没有再见过这病,会感觉皮肤下面有个小球

耶鲁公开课 - 生物医学工程探索课程节选

This is because orbital debris travels at speeds of thirty-two thousand kilometers an hour or more.

VOA: special.2009.04.01

It follows over eighteen thousand pieces of debris as small as the size of a baseball.

VOA: special.2009.04.01

Space debris made news on March twelfth when a part of an old rocket motor about ten centimeters in size threatened the International Space Station.

VOA: special.2009.04.01

Nicholas Johnson is chief scientist for orbital debris for the United States space agency.

VOA: special.2009.04.01

The space station has been hit in the past by very small debris.

VOA: special.2009.04.01

And,as more nations launch spacecraft, the risk of debris strikes will only grow.

VOA: special.2009.04.01

But the biggest debris-causing event took place in January, two thousand seven.

VOA: special.2009.04.01

Currently,there is no treaty to control the spread of space debris.

VOA: special.2009.04.01

On March twenty-second, NASA again ordered the astronauts on the linked space station and shuttle Discovery to move out of the way of another piece of debris from a rocket.

VOA: special.2009.04.01

It spread hundreds of pieces of debris.

VOA: special.2009.04.01

An estimated half million pieces of debris litter the Earth's orbit as a result of man's exploration of space.

VOA: standard.2010.07.24

Hundreds of rescue workers and volunteers dug through mud and debris Saturday looking for signs of survivors and recovering more bodies.

VOA: standard.2009.03.28

Many have cuts and broken bones from falling debris and burns from the intense heat of the explosion.

VOA: standard.2010.07.26

NASA officials say cameras mounted on Endeavour showed several pieces of debris falling away and hitting the shuttle during launch late Wednesday.

VOA: standard.2009.07.16

Buildings,homes,power and telephone lines collapsed, vehicles were washed away and many people were trapped under the debris.

VOA: standard.2010.08.06

Local television showed images of bodies and debris floating by what was left of the community.

VOA: standard.2009.03.27

When Nashville,Tennessee, was devastated by flooding this year, he helped people remove debris from their homes.

VOA: standard.2010.07.06

Japan has deployed land-to-air missile interceptors in case any debris threatens to fall on this country.

VOA: standard.2009.04.03

Japanese Defense Minister Yasukazu Hamada says he has ordered the interception of any dangerous debris, if anything goes wrong with North Korea's planned rocket launch.

VOA: standard.2009.03.27

The flood waters, carrying mud and debris, coursed down the mountain slopes of Ladakh, causing widespread damage in the region's main city,Leh, and surrounding villages.

VOA: standard.2010.08.06

Khan says the flood waters and the debris affected the airport runway,a hospital, the office of the state-owned telephone company, the bus stand,and a paramilitary camp.

VOA: standard.2010.08.06

First,he had 1,500 tons of debris removed from a Russian field station in Antarctica.

VOA: standard.2009.12.10

This plant turns debris from buildings - many destroyed by Israeli air strikes - into sand and gravel that is then turned into cinder blocks for building.

VOA: standard.2010.06.16

Several buildings collapsed. Rescue workers frantically searched for survivors in the debris.

VOA: standard.2009.10.28

Buildings are on fire and massive debris has piled on roads.

VOA: standard.2010.07.21

The explosions appear to have come from inside the buildings, with both the front and back windows of the Ritz Carlton blown off, spreading glass and debris across the street.

VOA: standard.2009.07.17

Soldiers search the debris pulling out the mannequin victims.

VOA: standard.2010.07.21