1. 人山人海：rén shān rén hǎi
a (the) sea of faces
Looking out upon the sea of faces, Mr. A delivered a touching speech.
Standing at his podium, President Clinton saw a sea of faces waving at him.
I saw a sea of faces from the top of the building.
2、家家有本难念的经：jiā jiā yǒu běn nán niàn de jīng ：
Many families have skeletons in the closet
Every family has its own source of shame
3、天下无不散的宴席：tiān xià wú bù sàn de yàn xí ：
All good things come to an end.
Eventually, all bosom friends will drift apart.
4、平时不烧香，临时抱佛脚：píng shí bù shāo xiāng ，lín shí bào fó jiǎo ：
Worship God every day; not just in times of adversity.
If you study hard every day, exams will not seem overwhelming.
5、挂羊头，卖狗肉：guà yáng tóu ，mài gǒu ròu ：
He applied bait-and-switch factics in business.
6、一言既出，驷马难追：yī yán jì chū ，sì mǎ nán zhuī ：
A word once let go cannot be recalled.
You can not take back what you have said.
7、祸从口出，言多必失：huò cóng kǒu chū ，yán duō bì shī ：
Careless talk leads to trouble.
The less said the better.
Shut the mouth and open the eyes.