Question

at n=no doing=as soon as？??这是什么意思，解释下

at the news ,he feel happy. ---on hearing the news,xxxx
at thatDasiy cried,i'm sorry i didn;t know that

Answer 1

5．On/upon+动名词
On arriving at the village，we werewarmly welcomed by the villagers.
我们一到那个村子，就受到了村民们的热烈欢迎。
(注) "on/upon+动名词"这一句型多用来表示时间的短促和动
作的紧凑，这一介词短语一般放在句首。动名词也
可换用相应的名词，如上例可改成：
On/ Upon our arrival home, we were warmly greeted by ourparents. =As soon as we arrived home, we were warmly greeted by our parents.
一到家，我们就受到了父母的热烈欢迎。
句中的谓语动词用一般过去时：on后的动名词，
一般来自表示去向性动作的动词，如arrive，reach，return， leave等。
6．at+动名词
At seeing her mother，the girl burstinto tears.
一见到母亲，那女孩就放声大哭起来。
(注) "at＋动名词"和上述"on+动名词"多放在句首。
动名词也可换用相应的名词，如上例可改成：
At the sight of her mother，...。句中的谓语动词用
一般过去时。at后的动名词，一般来自see，hear等
表示视、听感觉的动词。
例句：：at the news ,he feel happy. ---on hearing the news,xxxxat tha tDasiy cried,i'm sorry i didn;t know that。They were very angry at the sight of （ =as soon as they saw ） the broken wind