The weather starts to get cooler and the trees start to change colour.
天气开始变冷，树叶也开始变色了。
When September comes, it Starts to get cooler.
当九月到来时，天气开始变冷。
When September comes, it starts to get cooler, so after Labour Day we start classes.
九月到来，天气开始变凉，所以劳动节后我们开始上课。
When September comes, it starts to get cooler, so after Labour Day we start classes.
九月到来，天气开始变凉，所以劳动节后我们开始上课。
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