* Be touch and go万分危险
The patient is out of danger now, but it was touch and go for a while.
* Throw in the towel认输
She tried to save their marriage by talking her husband out of taking drugs. But she finally threw in the towel.
* Have the inside track for something处于有利地位
I'm an Art student. I don't have the inside track for applying for that job.
* Keep track of someone/something掌握……的情况
He is keeping track of all my old friends.
* Be on a gravy train走运，有机会赚钱
You will be on a gravy train if you can get that antique. It is worth more money than it is offered.
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