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1.top-selling 畅销的
例句：Radio 1's playlist is dominated by top-selling youth-orientated groups.
广播一台主要播放一些面向年轻人的乐团所演唱的畅销曲目。
2.heart attack 心脏病
例句：He died of a heart attack brought on by overwork.
他死于过劳引起的心脏病发作。
3.be essential to 对..重要
例句：It will be essential to establish how the money is being spent.
查清楚这笔钱将作何用途至关重要。
4.work on 从事于
例句：The scientists are still working on inventing new methods of reaching outer space.
科学家们仍致力于发明到达外层空间的新方法。
