首页  英汉  汉英  英英  词组  用法  例句  同义词  写作  俚语  缩写  词源  词根  法汉  德汉  日汉  俄汉  韩汉  西汉  意汉  泰汉  越汉

单词	permafrost
释义	permafrost /ˈpəːməfrɒst / noun [mass noun] A thick subsurface layer of soil that remains below freezing point throughout the year, occurring chiefly in polar regions: hilly terrain underlain by permafrost... The permafrost below the topsoil is frozen all year around, and this prevents roots from penetrating deeply into the ground. In regions influenced by permafrost, water migrates along the thermal gradient from warm to cold, thereby feeding ice in the frozen core. In many high mountains regions, permafrost may be present. Origin 1940s: from permanent + frost.
随便看	pindlin pindlin' pindling pindolol pin dot pindown pin drill pin-drop pin-dropping Pindus Mountains pin-dust pine pineal pineal body pinealectomise pinealectomised pinealectomize pinealectomized pinealectomy pineal eye pineal gland pinealocyte pinealoma pineapple pineapple bomb

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。