Nation says as more and more casting directors and filmmakers choose more natural looking talent, actors and actresses will become more cautious about having plastic surgery if their goal is to survive in the highly competitive business.

VOA: standard.2010.07.22

They should have been more cautious.

人们也应该更加小心的。

斯坦福公开课 - 经济学课程节选

They could have been more cautious.

他们本可以更加小心的。

斯坦福公开课 - 经济学课程节选

All sides are expressing cautious optimism that after more than a year and a-half, the peace process may start moving again.

VOA: standard.2010.05.03