Hygiene is the practice of keeping yourself and your surroundings clean, especially in order to prevent illness or the spread of diseases. 卫生
noun [抽象名词] 卫生;卫生学,保健学
She wasn't very fastidious about personal hygiene. 她不过分讲究个人卫生。
在希腊神话中有一个女神叫Hygeia, 被人奉为健康女神, 她的名字所基于的希腊词根hygi含有“健康的”之意。现在hygiene这个词作为医学术语, 表示“卫生, 卫生学, 保健(法)”