13. adapt=adjust=get used to=become/grow accustomed to 適應 v.6. decrease=crash=reduction=fall=drop 下降 n.8. sufficient=abundant=enough=adequate 充足的 adj.15. keep a check on=monitor=watch=keep an eye on 監視 v.雅思閱讀同義詞替換大全, 1. large numbers of=tens of thousa