The penny has dropped

耶鲁校友谈美国老师的教育方式

All comers?

That said?

Technically speaking?

Do you second-guess?

No strings attached?

羊群心理 Herd instinct

Ahead of the curve?

耶鲁校友支招 如何选择国外院校（二）

The meaning of war is lost on him?

Off and on?

Deer in headlights?

Piece of cake?

看美剧学口语：下课了怎么说

Informed decision?

The straight and narrow?

Last time I checked

Have baggage?

Don’t wear it on your sleeve

Well-heeled area?

Don’t take it to heart

Manufacturing hits brick wall

Safe and sound?

Scratching the surface?

Stay the course?

Written all over it?

Look the other way

Keep his feet to the fire

Don't expect anyone to cut you any slack