We have a live-in doctor if there's a problem I can't handle.
假如我遇到不能解决的问题 ,我们还有位驻家医生。
If you run after two heares, you will catch neither.
两头落空。
There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by surrounding them in defensive formation.