You can't take her promises seriously, she never keeps her word.
她答应的事不用当真,她说话从来不算数。
Beware of him who regards not his reputation.
要谨防不重自己名誉的人。
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.