Your days are numbered if you keep driving while drunk.
如果你继续酒后驾车，迟早会有危险。
(your days are numbered means you will die soon)
（your days are numbered指很快就会死去）
OK, I'll come to the party Friday. But Saturday it'll be time to hit the books.
好的，我星期五来参加聚会。但是星期六是该用功读书的时候了。
(hit the books means study)
（hit the books指用功学习）
I have to get up at 5:00 tomorrow morning. It's time to hit the hay.
我明天早上必须5点起床。该睡觉了。
(hit the hay means go to bed)
（hit the hay 指上床睡觉）
I'll be out of town this weekend, but I'll be in touch when I get back Sunday night.
这个周末我不在城里，但是星期天晚上回来后我会和你联系的。
(in touch means in contact)
（in touch指联系）
Social media are great for finding old friends with whom you've lost touch.
社交媒体可以帮助你找到失去联系的老朋友。
(lose touch means fall out of contact)
（lose touch指失去联系）