walk on eggs/eggshells 小心翼翼地做事；小心谨慎

在eggshell（蛋壳）上行走或者是滑冰？意思就是要“小心翼翼地做事；小心谨慎”。

When my mother is staying at our house, I feel like I'm walking on eggshells.

当我妈妈住在我们家的时候，我凡事都要小心翼翼。