尽管难以在盐碱地里栽种树木,但覆盖地表和湿地的植被异常丰富,随着地下水位和PH值的细微变化而呈现不同的形态。
Though it is di? Cult to grow trees in the saline-alkali soil, the ground cover and wetland vegetation are rich and vary in response to subtle changes in the water table and PH values.
但最近对泰坦内部的一项新研究却揭开了这颗奇异星球更为怪诞的一面:脆弱的甲烷冰地表之下,覆盖着一层冰泥,更深处依然是一个地下海洋,最中间是冰和岩石并存的固态核心。
But a new look at Titan's insides reveals even more oddities: Beneath the brittle crust of ice lies a layer of slush. Deeper still is an underground ocean over a solid core of rock and ice.
驯鹿喜欢青苔,因此如果周围没有饥饿的驯鹿,一大片青苔就会覆盖在森林地下叶层。
Reindeer love lichen, so without hungry reindeer around, thick carpets of lichen cover the forest understory.
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