The sneakers he is wearing is quite incongruous with his formal attire.

他穿的运动鞋与他的礼服极不协调.

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Certainly. Mr. Jones, would you like that casual or semi - formal attire?

好的. 琼斯先生, 服装是随便点还是半正式 呢 ?

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Dress is most often informal , except on weekends, when semi - formal attire may be worn.

去餐馆一般是穿便装, 只在周末时着半正式的服装.

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