On hearing that the police had finally found her...
在一听说警察终于/最后找到她了之后就立即
以上结构为“介词on+动名词hearing that”构成介词短语作时间状语,动名词hearing后面接1个that宾语从句
on prep在…后立即;一…就(英文解释You use on when mentioning an event that was followed by another one)
(1)on sth
She waited in her hotel to welcome her children on their arrival from London.
她在宾馆里等候,准备第一时间迎接孩子们从伦敦过来。
(2)on doing sth
On reaching Dubai the evacuees are taken straight to Dubai international airport.
撤离人员一抵达迪拜就径直被送往迪拜国际机场。
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介词 on 表示“...之后立即;一 ...... 就”的含义时,常接动名词或具有动词意义的名词。又如:
On reaching Dubai the evacuees are taken straight to Dubai international airport. 撤离人员一抵达迪拜就被径直送往迪拜国际机场。She waited in her hotel to welcome her children on their arrival from Lundon. 她在宾馆里等候,准备第一时间迎接孩子们从伦敦过来。(摘自《柯林斯中阶英汉双解词典2017年5月第1版》)