The clock has several " protective shells."

闹钟有几个“保护壳”。

Their eggs are laid out of the water and have a protective shell.

它们的蛋产在水边，并有保护性的壳。

China's Mars rover has captured a series of close-range images of its parachute and protective shell.

中国的火星探测器捕捉到了一系列关于其降落伞和保护罩的近距离图像。

The long-ago seas of the Carboniferous and Devonian swarmed with tiny plankton that wrapped themselves inside tiny protective shells.

泥盆纪和石炭纪的古代海洋里生活着大批微小的浮游生物。它们躲在小小的保护性壳里。

And like fish, amphibians lay eggs that don't have protective shells.

和鱼一样，两栖动物产下没有保护壳的卵。

Both of these two groups laid eggs without a protective shell.

这两组都在没有保护壳的情况下产卵。

These animals don’t have protective external shells. They’re unarmored. Naked.

这些动物没有保护性 外壳。 他们没有装甲。 裸。

Essentially, the idea is to provide a hard protective shell to protect the bones.

从本质上讲，这个想法是提供一个坚硬的保护壳来保护骨骼。

And that's when the ribs started to fuse into a plastron, which eventually became a full, protective shell.

那就是肋骨开始融合成腹甲的时候，腹甲最终变成了一个完整的保护壳。

Like many aquatic mollusks, oysters start life as exposed larvae, and quickly get to work building a protective shell.

像许多水生软体动物一样，牡蛎从暴露在外的幼虫开始生活，并迅速开始建造保护壳。

It's true that even the most un-observant of humans couldn't miss the resemblance, with my meaty folded hemispheres tucked into a protective, skull-like shell.

的确，即使是最不善于观察的人也不会错过这种相似之处，我那厚实的、褶曲的大脑半球被塞进了一个保护性的、类似头骨的壳里。

Unlike the temnospondyls, these early amniotes were free to reproduce far from the water, by laying eggs with protective shells, which were probably more leathery than mineralized.

与穿椎动物不同， 这些早期的羊膜动物可以在远离水的地方自由繁殖，它们产下带有保护壳的卵，这些卵可能比矿化的更坚韧。

It's a tiny hollow particle with a protective outer shell, about the size of a tattoo pigment, and you can fill the inside with practically whatever you want.

它是一个带有保护性外壳的微小中空颗粒，大小与纹身颜料差不多， 您几乎可以在里面填充任何您想要的东西。

The first is to retire into the protective shell of ones own kind by associating only with members of one's own culture and avoiding contacts with the host culture as much as possible.

为了使适应新文化的过程更加轻松，必须避免两个极端。第一种是退回到自己同类的保护壳里，只与自己文化的成员交往，尽量避免与宿主文化接触。

This protective shell, delays polymerization just long enough, so when the materials are slightly pressed together, the non-solvent helps transport the glue into the layers as it evaporates, resulting in an instant tough bond.

这种保护壳可以将聚合延迟足够长的时间，因此当材料被轻微压在一起时， 非​​溶剂有助于在胶水蒸发时将其输送到各层中， 从而立即形成牢固的粘合。