英语词汇upper polar怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	upper polar
释义	upper polar 简明释义上极网络释义短语 1 polar upper atmosphere 极区高层大气双语例句 1 The upper timberline, like the snow line, is highest in the tropic and lowest in the polar regions. 上行树带界线，比如雪线，在热带最高在极地最低。
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