这种物质聚合形成坚硬的塑料。
他拖着脚走在坚硬的木地板上。
牙齿有一层叫做釉质的坚硬表层。
恐龙湾中的化石嵌在坚硬的砂岩中。
The fossils at Dinosaur Cove are embedded in hard sandstone.
钻石是已知的最坚硬的矿石。
虽然那珊瑚看起来坚硬，它其实非常易碎。
巴尔马干酪是一个用来描述一类坚硬的意大利奶酪的通用名称。
Parmesan is a generic term used to describe a family of hard Italian cheeses.
马在坚硬冰冻的路上嘚嘚地跑过。
他的胳膊肘压着什么坚硬的东西。
太阳烘烤着泥土，使其变得非常坚硬。
我要做的是，我选择一个坚硬的石锤。
我只希望它是真正的岩石，坚硬而坚实。
脚垫结实，坚硬而厚实。
太阳把大地晒得坚硬。
铁锹撞击到坚硬的东西，他的脊梁骨一阵颤动。
The spade strikes something hard, sending a shudder through his spine.
为了不被坚硬的地板硌着，他把床做厚了一倍。
To prevent the hard floor from being felt, he made the couch twice as thick.
乌龟有坚硬的壳。
我必须想办法把玉米磨成面粉，但岛上的岩石不够坚硬。
I had to find a way to grind the corn into flour, but the rocks on the island were not hard enough.
她不得不坐在干燥坚硬的地面上，俯视着山谷和周围的一切。
She had to sit down on the dry, hard ground and look down into the valley and all about her.
如果那只动物受到惊吓，它会用它坚硬的蹄子伤害或杀死我。
If the animal became frightened, it could hurt or kill me with its hard hooves.
但是仍有一些水会保留下来，完全附着在岩石坚硬的表面上。
把本来结实又坚硬的胡萝卜放进开水后，它们便变得又光滑又柔软。
The strong and hard carrots became soft and weak after they were put into the boiling water.
其中一些表皮很坚硬——就像坚果的外壳——可以提供额外的保护。
Some of these coats are hard—like the shell of a nut—for extra protection.
许多食肉植物分泌酶以穿透昆虫坚硬的外骨骼，以从猎物体内吸收营养。
Many carnivorous plants secrete enzymes to penetrate the hard exoskeleton of insects, so they can absorb nutrients from inside their prey.
画必须有坚硬的画架，这样画布才会绷紧，而且颜料不能变质、开裂或变色。
Paintings must have rigid stretchers so that the canvas will be taut, and the paint must not deteriorate, crack, or discolor.
在这种情况下，骨骼或外壳的原始成分会保留下来，但化石会变得更坚硬、更耐用。
In such cases, the original composition of the bone or shell remains, but the fossil is made harder and more durable.
实际上，是角蛋白使它们变得富有弹性，并且没有角蛋白的话，它们会变得非常坚硬。
In fact, it's keratin which makes them flexible and without it they would be very rigid.
罗马人观察到，当火山灰与水混合然后冷却，火山灰变得非常坚硬，几乎不可能分解。
The Romans observed that, when volcanic ash mixes with water and then cools, it gets extremely hard and almost impossible to break up.
然而，欧洲人带来的绵羊、马、山羊和猪却有着坚硬的蹄子，这压紧了稀薄的土壤并导致了水土流失。
The sheep, horses, goats and pigs brought by Europeans, however, have hard hooves, which compress the thin soil and cause erosion.
植物的不同部位具有不同的食用价值：靠下面的部位是营养、多汁的叶子；上面更高的部位则是更为坚硬的茎杆。
The different vegetational parts differ in their food qualities: lower down, there are succulent, nutritious leaves; higher up are the harder stems.
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