Also left forever on the moon is a sign with these words: "Here men from the planet Earth first set foot on the Moon July,nineteen sixty-nine A.D.

VOA: special.2009.07.15

It's how quickly, how promptly we can recover from these painful emotions-- in other words, how strong our psychological immune system is.

区别在于他们能够多么迅速，多么快速地从痛苦情绪中恢复过来-,换言之，我们的心理免疫系统有多强。

哈佛公开课 - 幸福课课程节选

"We've heard the words he spoke on behalf of the world's number one democracy, he said - we've been waiting for these words for a long and he should know that the has friends and that Europe will from now on be an even stronger pillar that he can count on,".

VOA: standard.2009.04.04