chònɡ
要冲
yào chōng
strategic point; key position
水流得太冲，缺口堵不住。
Shuǐ liú de tài chōng, quēkǒu dǔ bù zhù.
The water flows too forcefully, the gap cannot be blocked.
这小伙子干活儿真冲。
Zhè xiǎohuǒzi gàn huór zhēn chōng.
This young man works really vigorously.