四个词都有北的意思 从词性给它们作区分 1、名词,只有North是北方、北部名词 不多说 2、形容词,四者都可做形容词.从词意区分.northern讲就是大面的北部的、北方的In northern countries,a north wind is colder than a south wind. North讲究的是某一地区的北部的~A north wind was blowing hard last night. northerly 更偏向于方向的确定--北方向的We set off in a northerly direction. northward作形容词好区分 意思就是向北的They walked northward with a curious feeling of disappointment. 3做副词,north多用于 在北方,northerly 意于来自北方,northward 视为向北 如果还是不太清楚请留言 我换种方式在做讲解,5,