重点讲解：
1. keep track of 跟上…的进展；掌握…的最新消息；
Bank statements help you keep track of where your money is going.
银行账单有助于你了解你的资金使用情况!PTg]~y*zm[tm2F4u0t。
2. at least （表示更正或改变自己刚说过的话）至少，起码；
Success was assured and, at least to start with, the system operated smoothly.
成功有保证了，至少该系统一开始运行得挺顺利yUgEBGyo=B7Kh[UxH。
3. be likely to do sth. 可能（做…）的；有（…）倾向的；
Tickets are likely to be expensive.
入场券可能很贵@M|zdx0~N73wlwhBdRc。
4. protect sb. from doing sth. 保护；防护；
The most important trees were tagged to protect them from being damaged by construction machinery.
最珍贵的树木都被贴上了标签，以防被建筑机械毁坏horvlC=+t~GD(AEGUJ4c。