The key stratum is not easy to cave, but once it is caved, there will be a sudden collapse of a rather thick stratum.

关键层较难崩落，但在崩落时具有突发性，会产生较大厚度岩层的突然垮塌。

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Researchers are working on ways to make thinner solar cells, on the order of hundreds of nanometers thick rather than micrometers, with the same performance, to lower manufacturing costs.

研究者正想办法制造更薄的太阳能电池，这样的想法要的是几百纳米而不是微米，要同样的作用，以减少制作成本。

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First, he found dinosaur nests that had been built between lava flows 10-15 metres thick-evidence that the animals were coping well with the volcanic activity rather than being weakened by it.

首先，他在10至15米厚的熔岩流中发现了恐龙巢穴，这证明当时的动物很好地应对了火山活动，而不是遭到了打击。

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The conventional wisdom holds that politicians must be packaged as feeling family types, rather than thick-skinned, sharp-elbowed machines dedicated to self-advancement.

ECONOMIST: Lexington

He is sweet, dedicated, and rather sexy with that thick accent.

BBC: X-Men 2: Your views

So it is ditching prescriptive standards which say, for example, how thick a door must be rather than merely how long it should be able to withstand a fire.

ECONOMIST: Deregulation in Japan