out of ones's depth

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out of one's depth

deep 古英语中指向下有相当大的延伸。十四世纪中期指有深度的东西。1560年代，指睿智、敏锐的头脑

depth由deep加上名词后缀th构成

out of one's depth指的是在深水区中某人不会或无法游泳，可能会沉下去。

If you are out of your depth,you do not have the experience or skill to deal with the situation you are in. 你就没有经验或能力来处理当前的情况。

John was out of his depth in that advanced calculus class.那堂高级微积分课，超出了John的理解能力。

You know, you are really out of your depth in this project.这个项目超出了你的能力范围。

I am sure I'm out of my depth in organic chemistry.我确信我对有机化学一窍不通。