snag
英 [snæg]
美[snæɡ]
	    - n. 障碍;意外障碍;突出物
 - vt. 抓住机会;造成阻碍;清除障碍物
 - vi. 被绊住;形成障碍
 
英英释意
- 1. a sharp protuberance
 
- 2. a dead tree that is still standing, usually in an undisturbed forest;
 - "a snag can provide food and a habitat for insects and birds"
 
- 3. an opening made forcibly as by pulling apart;
 - "there was a rip in his pants"
 - "she had snags in her stockings"
 
- 4. an unforeseen obstacle