noun · a hole, hollow, or depression in the ground

小心，别掉进地上的坑里。

verb · to bury people alive as a form of execution or mass killing

焚书坑儒是秦朝著名的历史事件。

verb · to scam, defraud, or trick someone out of something

那家店的价格太高，明显是在坑人。

noun · an excavation, shaft, or tunnel used for mining purposes

这个矿坑已经废弃多年了。