1Nautical the average of two latitudes; chiefly in "middle latitude sailing".
2A region roughly midway between the equator and either of the poles; usually in plural.
Early 18th century; earliest use found in John Harris (c1666–1719), writer and lecturer on science.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。