I'm all at sea.我是一片茫然。
all at sea 好形象
例句:
1.I'm all at sea; I've no idea how to repair cars.
我手足無措,不知道怎樣修理汽車。
2.My new hi-fi has so many lights and switches that I was all at sea when I first tried to use it.
我新買的那臺高保真音響設備有許許多多指示燈和開關,以致我第一次打開它時竟不知所措。