Because fresh water is lighter, care had to be taken not to draw down the lake too much in any given year lest the covering layer of fresh water becomes too light to hold the salt water down.

因为淡水比重较轻，所以每一年从湖中取水都需要慎之又慎，否则顶层淡水过少会无法覆盖咸水。

youdao

The influence of abr diameter is stronger than the thickness of concrete protective covering layer.

同时钢筋直径对钢筋锈胀力的影响程度要大于混凝土保护层厚度的影响。

youdao

The utility model belongs to the envelope improvement, composed of an envelope, an adhesive layer and a covering layer.

本实用新型属信封的改进。由信封、粘胶层、覆盖层组成。

youdao

So did a thick, solid layer of sheep dung covering the floor.

VOA: special.2010.08.03

Get through that covering layer and the underlying slivery colour of the aluminium itself will show through the black layer.

FORBES: My Testable Prediction About What Will Be Different About Apple's iPhone 5S

Zhong Yu of Greenpeace told the BBC's Chinese service there was a heavy layer of oil covering the coastline.

BBC: China oil spill after pipe blast 'worse than thought'

While P2i describes its invisible "hydrophobic layer" as covering the exterior and interior of a product, HzO touts what it calls "WaterBlock" technology, which is applied to the internal circuitry of a device to protect it from moisture.

CNN: Waterproof phones and tablets make a splash