阿丹：我们也可以说英语，但是可以中英文替换着轮流说。
Dan: We can speak English, too, but let's switch off and take turns.
鞋子应避免接触溶剂，酸，碱，油等。维持两双以上可替换的鞋，让鞋子轮流休息。
4 shoes should avoid contact with solvent, acid, alkali, oil and so on. Maintain more than two pairs of shoes can be replaced, so that the shoes turns to rest.
员工的轮流替换；
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