准星

yóu yú shī qù zhòng xīn tā jiǎo tóu wán quán méi yǒu le zhǔn xīng

由于失去重心，她脚头完全没有了准星。

She miskicked completely as she lost her footing.

tā xīn yǎn r tài huó shuō huà méi zhǔn xīng

她心眼儿太活，说话没准星。

She is too unpredicative, and her words are not reliable.