wisdom teeth

基本解释

If it were, we might have wings instead of wisdom teeth.
如果真的无可挑剔，那我们就应该长翅膀而不是智齿。
But wisdom teeth weren’t always a cash crop for oral surgeons. Long ago, they served as a useful third set of meat-mashing molars.
很久以前，智齿是作为把肉嚼碎的第三磨牙而派大用处的，不是像现在只是留给口腔医生去拔掉。
Some experts think that wisdom teeth and the appendix may be slowly on their way out -- some people are already born without them -- since they do sometimes cause life-threatening infections.
一些专家认为，智齿和阑尾可能正在慢慢退出，有些婴儿出生时就没有智齿和阑尾，因为它们有时候会引起威胁生命的细菌感染。

The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.
But why do we have wisdom teeth if we often need to get them removed?

Your wisdom teeth are the four large teeth at the back of your mouth that usually grow much later than your other teeth.