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。
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。
他的胳膊肘压着什么坚硬的东西。
我要做的是，我选择一个坚硬的石锤。
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.
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.
乌龟有坚硬的壳。
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。
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.
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.
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.
桦树有白色的树皮，树上这个坚硬的保护外层，这个白色的树皮，是防水的。
The birch tree has white bark, and this tough protective outer layer of the tree, this white bark, is waterproof.
在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。
During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.
大多数罗马陶器轻巧而光滑，摸起来很硬，但像所有的陶器一样，如果掉在坚硬的物质上就会碎裂。
Most Roman pottery is light and smooth to touch and very tough, although, like all pottery, it shatters if dropped on a hard surface.
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.
随着科学家们在地中海盆地的中部和最深处进行钻探，他们从岩心桶中取出了坚硬的、有光泽的结晶盐。
As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid, shiny, crystalline salt from the core barrel.
洞穴蝙蝠通常生活在坚硬的石头天花板上，它比习惯降落在枝叶繁茂的树梢上的蝙蝠要更小心地做好着陆准备。
A cave bat, which regularly lives on a hard stone ceiling, is more careful about its landing preparation than a bat more accustomed to landing in leafy treetops.
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.
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.
我们的爪子上长着坚硬的“壳”。
鞋子使人们在坚硬的道路上行走时不会伤到自己的脚。
Shoes keep people from hurting their feet while walking on hard roads.
曹的论文是关于石墨烯的——世界上最薄却最坚硬的物质。
Cao's papers are about graphene (石墨烯), the thinnest and strongest in the world.
事实上，有些蜘蛛网虽然是世界上最坚硬的材料之一，但是它们可以被拉得比橡皮筋还长。
In fact, some spiders' webs are among the world's strongest materials, but they can be pulled longer than elastic.
艺术不仅可以给别人带来快乐，而且它还表明，即使是冰冷、坚硬的铁，也可以用一点创造力恢复生机。
Not only can the art bring happiness to others, but it also shows that even cold, hard iron can be back to life with a little creativity.
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.
别惊恐——你应该吃的是菠萝坚硬的果核，而不是多刺的外皮。
Don't panic-- it's the tough core of the pineapple, not the prickly skin that you should tuck into.
在意大利的埃特纳火山，几百度的高温将这一池炽热的橙色岩浆与坚硬的灰色地壳分开。
A few hundred degrees separates this pool of fiery orange magma in Italy's Mount Etna from its hardened, gray crust.
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