重點講解：
1. round up
使聚攏；使聚集；
eg. He had sought work as a cowboy, rounding up cattle.
他找了一份放牛的差事，負責把牛趕到一起。
eg. I round up a few friends for a party.
我找了幾個朋友聚了聚。
2. keep in check
控制；
eg. He's found someone with a bit of fight to keep him in check.
他發現有個厲害的主兒能鎮住他了。
eg. The prisoners must be kept in check.
囚犯們必須嚴加管束。
3. gear up
為…作準備；為…作好了準備；
eg. I am now in high school, it's time gear up for study.
現在我是一名高中生了，該是努力學習的時候了。
eg. The ban was lifted last month, but aid agencies say it takes time to gear up.
此禁令已于上月取締，但是援助機構稱需要時間進行準備。
4. back down
放棄（主張、要求、承諾等）；打退堂鼓；
eg. He had to back down on plans to backdate the tax changes.
他不得不放棄追溯稅收調整的計劃。
eg. After being confronted with our evidence, the other side had to back down.
面對我們的證據，另一方不得不退讓。
5. room for
機會；余地；可能性；
eg. The intensity of the work left little room for personal grief or anxiety.
高強度的工作使人幾乎沒空去悲傷或者憂慮。
eg. There's lots of room to express yourself creatively.
有很多讓你展現創意的機會。