It is light as a feather but strong as steel.

VOA: special.2009.10.30

You've probably heard the phrase "Birds of a feather flock together" and that's true when it comes to romance.

你们可能听过一个成语,物以类聚，人以群分“,恋爱还真是这样。

耶鲁公开课 - 心理学导论课程节选

You've probably heard the phrase "Birds of a feather flock together" and that's true when it comes to romance.

你们可能听过一个成语,物以类聚，人以群分“,恋爱还真是这样。

耶鲁公开课 - 心理学导论课程节选