重點講解：
1. enable sb. to do sth. 使能夠；使有機會；
The new test should enable doctors to detect the disease early.
新的檢測手段應該能夠使醫生們盡早查出這種疾病!*=6T+68wl~GiwR35bW。
2. a constituent of 成分；要素；
Glycerol is a constituent of all fats and phospholipids.
甘油是所有脂肪和磷脂的組成部分;7yXriqa_N2UB;Za]。
3. so to speak 可以說；可謂；
I ought not to tell you but I will, since you're in the family, so to speak.
我本來不該告訴你的，但我還是要這么做，因為好歹你是家里的一員in8,%puCrzN5aLaIpB!。
4. because of 因為；由于；
It was very difficult to see our way because of the fog.
由于有霧，我們很難看清道路MTjNuULa%C=4~33L。