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传统的热狗使用的是一种叫硝酸钠的人工合成的添加剂，而天然或有机型的热狗则是用香芹粉或香芹汁来为产品防腐。

Conventional hot dogs use sodium nitrite, the synthetic version of the additive, while natural and organic versions use celery powder or celery juice to preserve their product.

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柠檬汁和苏打粉的混合溶液就是不会产生污渍的温和漂白剂。在清洗之前，把衣服在这种溶液里浸泡半个小时即可。

For a mild, stain-free bleach, soak your delicates in a mixture of lemon juice and baking soda for at least half an hour before washing.

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