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重点讲解：
1. persist in sth./doing sth. 顽强坚持；执著；
You have to persevere and persist in applying your knowledge.
你必须持之以恒，坚持运用你的知识。
2. in connection with 关于；与…有关；
All disputes in connection with this contract shall be settled through friendly negotiation.
所有与本合同有关的争执将通过友好协商解决。
3. at the request of 应…的要求；
At the request of delegations, there was a brief recess.
在一些代表团的要求下，进行了简短的休息。
4. rule out 排除；不予考虑；
I can't rule out the possibility of trouble.
我不能排除遇到麻烦的可能性。
n. 基底，基础，底部，基线，基数，(棒球)垒，[化]碱
