at sea
[æt si:]
在海上, 在航海中
茫然
例句与用法：
She tried to understand the instructions, but she was completely at sea.
她费尽力气想看懂那些说明文字，却全然不知所云。
The guide was ready enough with his usual pattern on the history of the place, but as soon as you began to question him on anything outside that, he was all at sea.
向导把该地历史的老一套讲得滚瓜烂熟，但当你一问起别的东西时，他就瞠目结舌，无言以对了。
I'm all at sea.
我一点主意也没有。
The ship has spent three months at sea.
轮船已在海上度过了三个月。
This painting is a representation of a storm at sea.
这幅画表现的是海上风暴。
After three days at sea we sighted the land.
在海上航行了三天，我们终于看见了大陆。
The refugees were at sea for forty days before reaching land.
这些难民在海上漂泊了40天后，他们的船才靠岸。
He felt completely at sea in his new school.
他在新学校中感到茫然不知所措。
1. 在大海上
He spent 3 months at sea.
他在海上航行了三个月。
2. 茫然
I'm rather at sea. Could you explain that again?
我实在不太明白, 你能再解释一下吗?