He's made hard metal sweat with the exertion of killing.

他让坚硬的金属流淌着杀戮的强力。

The muscles are as hard as a board, I answered.

肌肉坚硬得象木头一样。

It's got a hard shell on the inside.

内部有一个坚硬的壳。

The knife was too blunt to cut through the tough meat.

这把刀太钝了，切不开坚硬的肉。

Skeletons are rigid enough for this, and flexible enough for this.

骨骼足够坚硬，也足够灵活。

So in general, they are usually less stiff than solid wood but more rigid than plastic.

所以一般来说，它们通常没有实木那么坚硬，但比塑料更坚硬。

The ground becomes solid when the lava cools into hard rock.

岩浆冷形成了坚硬的岩石地面。

A diamond is hard and capable of shaping other surfaces.

钻石很坚硬，能够塑造其他表象。

Enamel is the hard mineralized outer layer of the tooth.

牙釉质是牙齿坚硬的矿化外层。

She specialises in eating tough seeds and nuts.

她擅长取食坚硬的种子和果实。

Would you expect this substance to be hard and insoluble in liquids?

你是否认为这种物质质地坚硬并且不溶于液体？

I just needed something solid to stop the fray between those fraternal twins.

需要一个坚硬的东西阻止双胞胎兄弟间的冲突。

Their think bark protects them close to the ground.

坚硬的树皮保护它们贴近地面的部分。

Turtles and tortoises have hard shells which protect their bodies.

龟有坚硬的龟壳来保护它们的身体。

And it'll be five years before it's hard like a shield.

五年后它才会像盾牌一样坚硬。

You want to avoid roads, hard trails with uneven surfaces.

你要避开路面不平坦的坚硬小径。

Only an electric drill is strong enough to do the job.

只有电钻够坚硬，可以进行这项工作。

A crack tooth can be caused by biting down on something hard.

牙齿开裂可能是由咬下坚硬的东西引起的。

He hammered some nails into the piece of hard wood.

他将一些钉子敲入那块坚硬的木头中。

Machines spray the insides with coloured sugar to give the beans their hard shells.

用机器在里部填充彩糖，形成坚硬外壳。