那只大狗冲着邮递员低吼，看上去很危险。

The big dog was ___snarling at the mailman, looking very dangerous.

别对我龇牙咧嘴的！她生气地喊道。

"Stop ___snarling at me!" she shouted angrily.

钓鱼线缠成了一团乱麻，他花了半小时才解开。

The fishing line was ___snarling into a tangled mess, and it took him half an hour to untangle it.