进行户外活动时,最好穿休闲服装。

For outdoor activities, it's best to wear casual clothes.

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For outdoor activities, it's best to wear casual clothes.

casual 是形容词,意思是"休闲的、随意的",来自名词 case(情况、场合),引申为"非正式的、不拘礼节的"。casual clothes 指适合日常休闲场合穿着的舒适服装。

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