晚安和goodnight的区别：语种不同，表达的意思一样，都是晚上分别或睡觉前的道别语。
You'll feel all the better for a good night's sleep.
你晚上睡个好觉就会感觉好得多。
I had a good night's rest.
我睡了一宿好觉。
Cats have good night vision.
猫在夜间视力好。
温馨提示：
