however

however
adverb
  1. used to introduce a statement that contrasts with or seems to contradict something that has been said previously
    然而,可是,不过
    People tend to put on weight in middle age. However, gaining weight is not inevitable.
    人们往往会在中年体重增加。然而,这并非不可避免。
  2. [relative adverb]in whatever way; regardless of how
    不管用什么方式;不管怎么,无论如何
    however you look at it, you can't criticize that.
    不管你怎么看它,你不能批评。
    ■[with adj. or adv.]to whatever extent
    不管多么
    he was hesitant to take the risk, however small.
    他不情愿冒风险,不管风险有多小。
用法
  1. When ever is used for emphasis after how or why, it should be written as a separate word. Thus it is correct to write how ever did you manage? rather than however did you manage?as distinct from other uses of the adverb however, which is always written as one word). However, with other words such as what, where, and who, the situation is not clear-cut: both two-word and one-word forms (both what ever and whatever, and so on) are well represented, and neither is regarded as particularly more correct than the other
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