问题描述：
英语翻译
1.Long ago london was not a clean city .there was a lot of smoke in the air because there were lots of factories this is not true today .the air there is quite clean now
1.Long ago london was not a clean city .there was a lot of smoke in the air because there were lots of factories this is not true today .the air there is quite clean now
问题解答：
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