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重点讲解：
1. reward with 奖赏；奖励；酬谢；
She was rewarded for her efforts with a cash bonus.
她因自己所作的努力而得到一笔奖金。
2. make sure 一定要；设法保证；
Make sure you are strapped in very well, or else you will fall out.
一定要系好安全带，否则会摔出去。
3. at first 最初；起初；开始时；
Dart, who had at first been very tense, at last relaxed.
起初，达特非常紧张，最后终于放松了下来。
4. at randowm 随机地；偶然地；
We received several answers, and we picked one at random.
我们收到了一些答复，并从中随机挑选了一个。
n. 能力，管辖权，技能
