A: We found in the examination that 20 % of the goods have rusted, please exchange them.

我们在检验中发现竟有20%的货物已生锈.所以请贵方给予调换.

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Mary and Tom, please exchange your seats.

请玛丽和汤姆交换一下座位.

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Please exchange their positions.

请换一下他们的位置.

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Please exchange twenty thousand yen into dollars.

请将两万日元换成美金.

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