重点讲解：
1. at least （数量）至少，不少于；
Cut the grass at least once a week in summer.
夏天至少每周割草一次fEGl5BUnmziU。
2. decide to do sth. 决定，拿定主意（做）；
Students may decide to seek tutorial guidance.
学生可以决定寻求导师指导&Nh#.1,yXJ。
3. seek to do sth. 力图；想方设法；
The maintenance programme will additionally seek to keep the sites free of graffiti.
这个维护方案还会试图保护这些地点不被涂鸦_[wu&VN2fa。
4. a series of 一连串；一系列；连续；接连；
The deal ended after a series of rancorous disputes.
经过一连串充满敌意的争吵，交易泡汤了kL;H*xZHxMbPv。