1. ex- => es- => as- "out" + -tound (ton-) "thunder" + -ing.
2. 这里的 as- "out" 取引申义，表示：离开、脱离正常的状态或情绪或表情。
3. 字面含义：thunder sb out. => leave someone thunderstruck.
4. 或者：out: 出去、离开、远离。=> 不管。=> 听任、让、使…处于(某种状态)(leave)。

1. There was an astounding 20% increase in sales.

销售量惊人地增加了20%。

来自《权威词典》

2. The Chairman's remarks were so astounding that the audience listened to him with bated breath.

主席说的话令人吃惊,所以听众都屏息听他说.

来自《简明英汉词典》

3. The results are quite astounding.

结果令人无比震惊。

来自辞典例句

4. The conservatism of the literary establishment in this country is astounding.

这个国家文学界的因循守旧令人震惊。

来自辞典例句

5. This is the most astounding confession I have ever listened to.

我从来没听到过谁坦白出这样的事情.

来自辞典例句