重點講解：
1. less than
（用在數字或數量前）少于，低于，比…少；
eg. Motorways actually cover less than 0.1 percent of the countryside.
高速公路的實際覆蓋面積還不到農村地區的0。1%。
eg. Less than a half hour later he returned upstairs.
不到半個小時，他又跑上樓來。
2. cling to
纏住；依附；
eg. The road extends several miles along coastline, then cling to the inland.
這條路延海岸線延伸了幾英里, 然后轉向內陸。
eg. I have had too many identities to cling to one name!
我有太多的身份而不能被附著于一個名字上。
3. by far
（比較時用作強調）顯然，…得多，大大地；
eg. By far the most important issue for them is unemployment.
對他們來說最重要的無疑就是失業問題。
eg. It was better by far to be clear-headed.
保持頭腦清醒要好得多。