点击下方单词,选择对的这个单词
1. define clearly
e.g. I cannot narrow down the rules for this game
Synonym: pin downnail downnarrow downnarrowspecify
2. fasten or secure with a wooden pin
e.g. peg a tent
Synonym: peg
多通过句子记忆单词，而不是单独死记硬背。
