night前用什么介词

前用介词at，例如：

1、A tripod also lets you shoot long exposures at night.三脚架也可以让你在晚上长时间曝光。

2、If headaches only occur at night， lack of fresh air and oxygen is often the cause.如果只是在晚上头疼，那常常是由于缺乏新鲜空气和氧气的缘故。

3、She doesn't like to walk home late at night.她不喜欢深夜步行回家。