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讲解：
request (for sth) | ~ (that...)
(正式或礼貌的)要求,请求:
They made a request for further aid.
他们要求再给一些帮助。
have to do
必须；不得不:
Did she have to pay a fine?
她非得交罚款吗？
evolve (from sth)
进化；演化:
The three species evolved from a single ancestor.
这三种生物从同一祖先进化而来。
deep down
在内心深处；在心底:
Deep down I still loved him.
我在内心深处仍然爱着他。
rip up
把某物撕碎:
He ripped up the letter and threw it in the fire.
他把信撕碎,扔到炉子里。
n. 水獭；水獭皮
