As in China,the weather in Canada is different from area to area.跟在中国一样,加拿大的天气随区域的变化而不同.In the north,the winters are long and hard,WHILE the west coast of Canada is a fairly warm ...要怎么用？通常连接两个句子，两个句子是对比关系；比如：I like oranges while Lily likes apples. 用法还是很简单，没有特殊要求。就是说可以翻译成“但是”　是吧？可以