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重点讲解：
1. preside over 负责；主持；
Who preside over the meeting have not be decided.
这个会议要谁来主持还未决定。
2. grapple with 努力解决（问题）；设法克服（困难）；
He did not at all grapple with the real question.
他根本没有设法处理真正的问题。
3. for sure 无疑；肯定；
You can't say for sure that it won't rain tomorrow.
明天难保不下雨。
4. interfere in 干涉；干预；介入；
We will always keep our promise not to interfere in the internal affairs of other countries.
我们始终遵守不干涉别国内政的诺言。
adv. 平滑地，流畅地
