let in 让……进来，放进 What does you here? Who have you let in? 谁让你们进来的？你们在做什么？ They waited for hours before they were let in. 他们等了好几个小时才让进去。 We should open the windows often to let in fresh air. 我们应常常开窗让新鲜空气进来。 He knocked at the window to be let in. 他敲敲窗户要进来。 Are you going to let them in on the plans? 你是否打算让他们知道这些计划？
