谁能帮我详细解释一下however的意思?

conj.
1.然而,可是,不过
I feel a bit tired.However,I can hold on.
我有点累了,但我能坚持下去.
ad.
1.无论如何,不管怎样
However hot it is,he will not take off his coat.
无论多热,他也不会脱掉外衣.
2.不管用什么方法
However he tries,he never seems able to work satisfactorily.
不管他怎么努力,他好像总不能令人满意地工作.
3.究竟怎样,到底如何
However did you know that?
你到底怎么知道那件事的?

however的用法
1、however可以做副词，含义为“但是，可是，不过”。多插在句中，有时放在句首或句尾。
例如：However，they did not seem to have much effect.
不过，他们似乎没有起太大的作用。
He said that it was so;he was mistaken，however.
他说事情就是这样...

无论如何

有几种意思，作副词用时,1.意思为无论如何,不管怎样,需要另起一个句子，后跟形容词,等于no matter how
eg,he failed ,however hard he tried.
2.然而,不过.She gets up early；she missed the bus ；however.