in order to/so as to

in order to + v 和 so as to + v 的基本含义是相同的，都表示目的。但是前者比较正式，因此，常用于庄重的语体中，尤其是科技英语中。请对比：

1. Students should take notes so as to make revision easier. (CGEL) 学生应当记笔记以便于复习。

2. We picked apples so as to make a pie. (DAI) 我们采了苹果,以便做饼。

3. Go in quietly so as not to wake the baby. (Whitford) 要静静地走进去，以免吵醒婴儿。

4. He was saving as much as possible in order to repay Jennie eventually. 他尽最大可能来节省钱，以便最后还给珍妮。

5. In order to calculate the amount of power, work is divided by time. 要计算功率的大小，可将功除以时间。

6. In order for water to change into steam, it must receive enough energy to separate the molecules from each other. 为了使水变成蒸汽，必须使它得到足够的能量使其分子彼此分开。