The decorative mum is often seen in gardens.

VOA: special.2010.06.29

I don't know how much you've seen, but quite often the way you learned physics earlier on in high school is probably different from the way professional physicists think about it.

我不知道你们对物理有多少了解,但你们以前在高中所学的物理知识,和资深物理学家们的看法,常常是很不一样的

耶鲁公开课 - 基础物理课程节选

Probably the most, the place I've seen most often is the Lower East Side.

我见过最多的地方大概就是下东区了。

电影里的中央车站 - SpeakingMax英语口语达人

Thousands of people a day have seen the exhibit, which is often sold out.

VOA: special.2010.03.05

If it is a meter or more thick, however,blue light often can be seen.

VOA: special.2010.01.05