so as to与such as to有什么区别

so as to：为了.；以便.
例：
The test questions are kept secret so as to prevent cheating.
考试题保密以防作弊.
such as to：到如此程度以致；如此.以致
例：The pain in her foot wasn't such as to stop her walking.
她脚疼,但还不至于不能行走.

so as to:

为的是,以便

例句与用法:
1. He ran quickly so as to catch the last bus.
他跑得很快以便赶上那末班车。

2. The two lovers dropped back so as to be alone.
那对情人落在后面，为的是两人好单独在一起。

3. I left a message so as to be sure of contacting her.
我留下了张条子以便与她取得联系。

4. Gummed so as to adhere.
涂胶的涂上胶以便粘附的

5. Listen carefully so as to follow the teacher.
要仔细听才能听懂老师讲的课。

6. The book will be indexed in the next edition so as to make it more useful.
为了使它更实用，这本书在下一版本中将编有索引。

7. We use our eyelids to blink so as to clean our eyes.
我们利用眼睑眨眼来清洁眼睛。

8. Please check the list carefully so as to avoid mistakes.
请仔细核对单子以避免