重点讲解：
1. at least （数量）至少，不少于；
At least ten people were killed in the crash.
至少有十人在撞车事故中丧生。
2. due to 由于；因为；
The train had stopped due to a mechanical problem.
火车因为机械故障停了下来。
3. rule out 排除；不予考虑；
Police have ruled out robbery as a motive for the killing.
警方已排除因抢劫而杀人的可能。
4. take place （尤指在控制或组织下）发生，进行，举行；
The next Rugby World Cup will take place in three years' time.
下一届橄榄球世界杯赛将于三年后举行。

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