n.下面,底面
adj.水面下的
It seemed a singularly ill-judged enterprise for Truman to undertake.
这对于杜鲁门来说似乎是一项特别不明智的事业。
I can undertake that you will enjoy the play.
我保证你会喜欢这个剧.
We can't undertake that you will make a profit.
我们不能保证你会获利.