These jagged pyramids a hundred metres tall 这些高达100多米的锯齿般的石锥
Star dunes like these can be 300 metres high. 这些巨型沙丘高达300多米
The heaviest sand rises only a few metres above the ground, 最重的沙子只能离开地面几米
but the dust can be blown 5,000 metres up into the sky. 但是尘埃却能被吹上5000多米高的天空
when cavers dug through several metres of loose rock 洞穴专家们在松散的岩层中 挖出了一条几十米深的通道
When the nearest exit may be hundreds of metres or more away, 最近的出口可能远在 几百米之外或者更远的地方
often more than 60 metres from the floor. 通常高出地面60多米
so although this rocky escarpment in the United States is now hundreds of metres above sea level 所以 尽管美国境内的这座石壁 如今矗立在海平面以上几百米高的地方