the material that forms the hard outer covering of many animals.
覆盖许多动物外表的坚硬材料。
Crumble away
像石头等（坚硬的材料）碎成细片
The feeler material must be harder than the material that is checked (hardened pins).
测隙片的材料必须比被检查的材料更坚硬(被硬化的针)。
a protective head covering made of hard material to resist blows.
一种用坚硬的材料做的、抵制击打的保护性帽子。
Made of hard, strong, conglomerate construction material.
混制的用坚硬、结实的混合建筑材料制成的
It looks like any other plastic and can be hard or soft, and able to change shape.
这种材料很像塑料，质地或坚硬或柔软，可以改变形状。
Each sleeping room shall be provided with a table or desk, whichmay be of the fixed, drop- leaf or slide-out type, and with comfortableseating accommodation as necessary.
家俱应由平滑、坚硬且不易弯曲和腐蚀的材料做成。
In the 12th dynasty, amethyst was used for the first time (a very hard material).
在第12个王朝内，第一次使用紫水晶(一种很坚硬的材料)。
The furniture should be of smooth, hard material not liable to warp or corrode.
家具应使用光滑、坚硬、不易变形和腐蚀的材料制作。
a hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material.
一种坚硬的晶体变质岩，光泽好，用于雕塑，亦用作建筑材料。
made by turning under or folding together and stitching the seamed materials to avoid rough edges.
通过变相互折叠和缝纫接缝材料来避免坚硬的边缘造成的缝。
To fasten securely with a long, straight, rigid piece of material.
闩用长而直且坚硬的材料制成的东西牢固地系紧
small handsome round-headed deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye.
小型圆顶落叶木，顶端有可观赏性白花，木材坚硬，产生一种黄色染料。
very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye.
十分坚硬的洋苏木心材，棕色到红棕色，用于配制一种紫红色染料。
a calcareous material harder and denser than bone that comprises the bulk of a tooth.
一种比骨坚硬致密的石灰质材料，构成牙齿的主体。
exceptionally tough or hard wood of any of a number of ironwood trees.
特别坚硬的铁木木料。
hard yellowish wood of a yellow pine.
黄色坚硬的黄松木料。
valuable hard wood of the sycamore
西克莫木材（材质坚硬而贵重）