Mark Bedau of Reed College in Oregon says Mister Venter's work marks an important step over traditional genetic engineering of individual genes.

VOA: special.2010.07.20

And step seven is how many electrons do we have left over that are going to go into lone pairs? How many?

而第七步是我们剩下,多少电子成为孤对电子？多少？

麻省理工公开课 - 化学原理课程节选

What he has been trained to do, what he knows he needs to do is to fight forward and somehow step over her, step on her, do whatever he has to do to fill this hole.

他所接受的训练,他的知识告诉他,他要做的是向前进攻,设法从她身上跨过,或者踩在她身上,尽力去填补这个缺口

耶鲁公开课 - 古希腊历史简介课程节选

"And this event, which is being streamed live over the Internet, marks an important step towards achieving that goal."

VOA: standard.2009.03.26

She says the first step is to determine if Madni was on a stop-over there and if so, other legal action will be set in motion.

VOA: standard.2009.07.28

"If one country makes an immense step forward, even like the U.S.has done over the years with a very strong regulatory agency like FDA, with very good law enforcement in place,with good coordination around the world, it's not sufficient for the rest of the world.

VOA: standard.2010.06.07