1. Dig a pit and bury the garbage.
    挖一个坑把垃圾埋了。

2. Don´t let the child fall into the pit.
    别叫孩子掉进坑里去。

3. In my mouth I have a sour, vinegar taste coming from the pit of my stomach.
    我嘴里有一股从胃底涌上来的酸酸的醋味。