let in -用法

let in

1．（of water）enter by leakage （水）漏入

These rubber shoes are letting in water．They need repairing．这双胶鞋漏水，得补一下了。

2．admit；allow to enter or penetrate容许进入

You'd better open the window and let in the light and fresh air．你最好打开窗户让光线和新鲜空气进入室内。