悉尼是澳大利亚最大的城市，人口超过400万。
Sydney is the largest city with a population of more than four million people in Australia.
这时，迈克和克莱尔是在一所学校在悉尼，最大的城市之一。
At the moment, mike and Clare are at a school in Sydney, one of the biggest cities in Australia.
悉尼是澳大利亚最大的城市。
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