(一). It's now or never.机会不会降临第二次? /现在不做就没机会了.
原音重现：

A: I'd like to ask Sue to marry me.
我想向苏求婚。
B: It's now or never. Go for it.
现在不去就没机会了，赶紧去吧。

(二).This is a huge I big / great I perfect opportunity. 这是一个非常好的机会。
原音重现：
A: My dad said I could have a job at his company.
我父亲说我可以到他的公司工作。
This is a huge opportunity for you to become successful.
这是你工作的的好机会。