When bonding the same type dentin substrate, the resin rags were shorter and the hybrid layer thinner in used self-etching adhesive than total-etching adhesive.

全酸蚀粘结系统与自酸蚀粘结系统作用同类型的牙本质上，自酸蚀比全酸蚀形成的混合层薄，树脂突短。

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The chances for a total meltdown at the pole are higher than ever because the layer of ice coating the sea is thinner than ever, he said.

北极全面融冰的机会要高于往年，这是因为覆盖海洋冰层的厚度比以前薄了，他说。

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This synaptic pruning, as it is called, causes the brain's cortex-the outer layer of gray matter where we do much of our conscious and complicated thinking-to become thinner but more efficient.

我们称之为突触的自我修剪，保持意识清醒和用来复杂思维的大脑皮层，外面的灰质外层变得更薄但更高效。

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The researchers found that the rodents' preferences varied slightly between strains, as well as between sexes (with females partial to higher temperatures, possibly because of their thinner protective layer of fat), confirming that there is no single set of conditions in which all mice feel cosy.

ECONOMIST: ��and they may return the favour

The display screen for the iPhone 5 could reduce a layer of glass if the metallic layer for the touch screen is applied to the protective glass, and the result would be a thinner screen.

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