let down 放下,降低;使失望
live on (动物)以...为食;(人)靠...生活
look after 照顾,照料;注意,关心
look back 回头看;回顾,记忆
look down on/upon 看不起,轻视
look forward to 盼望,期待
look into 调查,观察
look out 留神,注意
look through 仔细查看;浏览,温习
make out 辨认出;理解