Your real education doesn't start until you get out into the real world.
直到你踏入现实社会,你才真正开始学习。
This milk has gone bad.
这牛奶变质了。
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land.