so as to该短语的意思.是跟in order to 在一起比较的，两者的区别。

使得,以致
如此..以致于

so as to
为了…

1）为了，使得, 以致
2）如此...以致于
例句
Tom kept quiet about the accident so as to keep his job.
为了保住他的工作，汤姆对此事故避而不谈。

so as to
adv.
使得, 以致
如此...以致于
例如
so as to be manageable.
如此……以至于便于管理。

so as to 以便,为的是 例句：He ran quickly so as to catch the last bus.他跑得很快以便赶上那末班车.Look for the old so as to learn the new.温故而知新.区别：两者都可以引导目的状语从句“为了…”,in order ...