点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
1. completely obstructed or closed off
e.g. the storm was responsible for many blocked roads and bridgesthe drain was plugged
Synonym: blocked
2. (of a coin) altered by the insertion of a plug of base metal
多通过句子记忆单词，而不是单独死记硬背。
