work late into the night

Unit 23 Mainly revision ... 开心 be happy 开夜车 work late into the night 开饭 serve a meal ...

late, lately, later,&n... ... early and late 从早到晚 work late into the night 工作至深夜 late in autumn 在深秋 ...

... //a large population 人 口众多// be late in doing//work late into the night 工作到深夜 // home /native land 祖国// ...