再看下句汤姆的爸爸本周末就要回来了，他爸爸在北京工作。
Tom's father who works in Beijing will come home this weekend.
如果再看看平均门店营业面积，上海比北京小，所以，上海的连锁超市在经营绩效上要比北京好。
If further look at the average store area, Shanghai is smaller than Beijing; thus the operating efficiency of chain supermarket in Shanghai is better than the one in Beijing.
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