英语语法分析

They're all wearing mortarboards and you can't see his face.

他们都戴着学位帽，你看不到他的脸。

You have a built-in cap, and I'm not referring to the mortarboards on your heads.

你们戴了一顶内置的帽子——我并不是指你们戴在头上的那顶学位帽。

Faces were somber as the dean commemorated the dead, but graduates broke out in cheers and tossed their mortarboards in the air as the ceremony concluded.

当校长纪念死去的学生，一张张阴沉，当典礼到了尾声，毕业生们发出欢呼声，并将毕业帽丢入空中。