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重点讲解：
1.in order to 目的；为了……起见；以求
例句：In order to do his scientific experiment, Edison had to be out for dust at the age of his teens.
为做科学实验，爱迪生在十多岁的年纪时就得出去挣钱。
2.the portion of ...部分
例句：The top portion of the shoe, or the upper, is usually made of leather, synthetic leather, or a combination of materials.
鞋的顶端部分就是鞋面，通常由皮革、合成革或者是材料的组合。
3.lack of 缺少；不足；不够
例句：The lack of a social safety net is often blamed for the high Chinese saving rate.
缺乏健全的社会安全保障经常被认为是中国高储蓄率的一个原因。
4.or not 不论……是否；或者不是
例句：Whether it works or not, it shows how much the nature of modern belligerency is changing.
不管这是否可行，都说明了当代交战状态的性质正在改变。
