古代要塞城墙上的射击孔让士兵可以安全地向敌人射箭。

The ancient fortress walls had small ___loopholes for soldiers to safely shoot arrows at enemies.

律师发现合同中的漏洞，让客户可以合法地规避责任。

The lawyer found ___loopholes in the contract that allowed the client to legally avoid liability.