wisdom teeth

基本解释

If it were, we might have wings instead of wisdom teeth.
如果真的無可挑剔，那我們就應該長翅膀而不是智齒。
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，智齒是作爲把肉嚼碎的第三磨牙而派大用処的，不是像現在衹是畱給口腔毉生去拔掉。
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.
一些專家認爲，智齒和闌尾可能正在慢慢退出，有些嬰兒出生時就沒有智齒和闌尾，因爲它們有時候會引起威脇生命的細菌感染。

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.