手足无措

wǒ kàn jiàn fā dòng jī mào yān shí xià de shǒu zú wú cuò

我看见发动机冒烟时，吓得手足无措。

I panicked when I saw smoke coming out of the engine.

wàng le yǎn jiǎng cí shǐ de zhè wèi jiǎng yǎn zhě shǒu zú wú cuò

忘了演讲词使得这位讲演者手足无措。

Forgetting his speech disconcerted the speaker.

wǒ shǒu zú wú cuò bù zhī dào zěn yàng xiū lǐ qì chē

我手足无措，不知道怎样修理汽车。

I have no idea how to repair cars.