A new study suggests that parents who wash their dishes by hand, rather than in a dishwashing machine, may unwittingly lower the likelihood that their children will develop allergies.

一项新研究表明，父母用手洗碗——而不是用洗碗机——可能在无意中降低孩子患过敏的可能性。

The new study, published in the journal Pediatrics, looked at whether a number of behaviors that expose children to bacteria early in life might protect them from developing allergies later on. The idea, known as the hygiene hypothesis, is that children raised in particularly sanitized environments are less likely to develop an immune tolerance to trivial threats.

这项新研究发表在《儿科学》(Pediatrics)杂志上，它研究的是一些让儿童接触细菌的行为能否防止日后出现过敏。这个观点被称为卫生假说，它认为在特别干净的环境中养大的孩子更加难以对无关紧要的威胁产生免疫力。

The researchers followed roughly 1,000 young children and their parents living in the Gothenburg area of Sweden. They investigated behaviors like whether the parents fed their children foods purchased directly from farms, such as eggs, meat and unpasteurized milk. They looked into whether the children ate fermented foods, which have beneficial probiotic bacteria. And they looked into whether the parents washed their dishes by hand or used a dishwasher.

研究者调查了瑞典哥德堡地区约1000名幼儿及其父母的生活。他们调查的行为包括：父母是否用直接从农场买来的食物喂养孩子，比如鸡蛋、肉类和未经高温消毒的牛奶；这些孩子是否食用含有益生菌的发酵食物；这些父母是用手还是用洗碗机洗碗。

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