This letter had a large green stamp on it. The address was written in small letters in blue ink.

信封上是大大的绿色的邮戳，地址是蓝色小体字。

youdao

"The main concern for us is that these plant-derived products have a green stamp on them just because they're derived from biomass," said study author Amy Landis of the University of Pittsburgh.

研究作者，来自匹兹堡大学的Amy Landis说：“我们主要关心的是虽然这些源自植物的产品都有着一个‘绿色’的邮戳，但这仅仅是因为它们来源于生物质。”

youdao

You have two stamp. one red, one green.

你有两个章。一个红的，一个绿的。

youdao

"This letter had a large green stamp on it.

VOA: special.2009.12.26

The designers expect their creation to be the first airline terminal in the country to get an official green stamp of approval, in the form of a LEED Gold certification from the U.S. Green Building Council.

FORBES: Richard Branson Unveils New Eco-Chic San Francisco Airport Terminal

Unlike companies, homeowners do not need LEED's stamp of approval to please employees or to show good corporate citizenship, notes Nathan Good, a green architect based in Portland, Oregon.

ECONOMIST: A green rating system for America��s homes