Wherever these particles settled, they formed a pan, a layer that water couldn't penetrate.

不管这些粒子沉降在哪里，它们会形成一个平面板块，一层水无法渗透的平面。

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Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface.

地质学家认为，这个具有流体化喷出物的陨石坑表明，在地表下几米深处有一层永久冻土层或水冰。

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There're two reasons for this: first, they live in the active layer, which, remember, contains water that doesn't penetrate the permafrost.

造成这种情况的原因有两个：首先，它们生活在活动层中，请记住，活动层中包含的水不会渗透永久冻土。

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Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

The lipids will form a bi-layer where the water soluble part of the lipid points out of this layer and the oily part points in.

脂质会形成双层膜,水溶性部分朝向膜层外,而脂溶性的部分朝向双层膜内部

耶鲁公开课 - 生物医学工程探索课程节选

The fascinating part about this layer is that it solves the problem for phospholipids about how to exist in water when half of you wants to be in oil, and that the water soluble part of the top leaflet here, of the top points up into the water, and the fatty acid chains point down.

这层膜的迷人之处在于,它解决了磷脂,如何存在于水中和油脂中的问题,水溶性的顶端部分,向上插入水中,而脂肪链则指向下

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That work showed acoustic invisibility in a shallow layer of water, at ultrasound frequencies above those we can hear.

BBC: Acoustic 'cloaking device' shields objects from sound

The study in Nature Geoscience also asserts that the cool melt water layer may limit the amount of water sucked from the oceans that falls as snow on Antarctica.

BBC: Melt may explain Antarctica's sea ice expansion

The sea ice expanded during Southern Hemisphere autumn and winter in response to the development of a fresh, cool surface water layer, which floated on the denser, warmer salty sea water below.

BBC: Melt may explain Antarctica's sea ice expansion