In the north of China, leaves usually fall down when autumn comes.
在中国的北方,树叶通常在秋天到来时飘落。
When fall comes he is already paunched and ready to go back to the mountains.
当秋天来临的时候,它已经把肚子吃得圆鼓鼓的并且准备上山去了。
The fall in revenue comes when TfL is struggling to complete an ambitious project to upgrade the underground network and provide new services.
大伦敦交通委员会本来准备升级地铁线路并提供新的服务,但收入的下降打乱了这项宏伟的计划。
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