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沙子与袜子和睡衣不可以一起洗涤。
沙子会磨损衣物，尤其是质地较柔软或细腻的物品，如袜子或睡衣，沙子中的杂质和细菌可能会在洗涤过程中污染衣物，导致衣物不卫生，在洗涤袜子或睡衣之前，应该先清理掉上面的沙子。
英文表达为：Can sand be washed together with socks and pajamas? The answer is no. Because sand will wear out the clothes, especially the soft and delicate ones like socks or pajamas. Additionally, impurities and bacteria in the sand may contaminate the clothes during the washing process, making them unhygienic. Therefore, it is recommended to remove the sand before washing socks or pajamas.