snag

n. /snæɡ/ C1

意外障碍；小隐患

A small, unexpected problem or difficulty.

仙境例句

The Rabbit's plan had one snag: the door opened inwards, and Alice's elbow was against it.

白兔的计划有个小麻烦：门是往里开的，而爱丽丝的胳膊肘正抵着门。