a specialized bony substance covering the root of a tooth 同义词：cementum,
something that hardens to act as adhesive material
a building material that is a powder made of a mixture of calcined limestone and clay; used with water and sand or gravel to make concrete and mortar
concrete pavement is sometimes referred to as cement; "they stood on the grey cement beside the pool"
any of various materials used by dentists to fill cavities in teeth
make fast as if with cement; "We cemented our friendship"
bind or join with or as if with cement
cover or coat with cement
In the most general sense of the word, a cement is a binder, a substance that sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as binder.
例句与用法
1.
The cement appears to be a liquid protein . 胶接剂看去象是一种液态蛋白质。
2.
The rod can be cemented in . 我们可以把投影杆用水泥胶合起来。
3.
The teeth were firmly cemented in their sockets . 牙齿被牢固地粘合在其孔窝内。
4.
Cement is the bond in concrete . 在混凝土中水泥是粘结剂。
5.
The builders poured a solid foundation of cement . 建筑工人浇注了坚实的水泥地基。
6.
The cows were prodded into a narrow cement corridor . 牛被赶到一条狭窄的水泥过道。
7.
Cement is made from limestone . 水泥是由石灰石造成的。
8.
Do not walk on the wet cement . 不要在湿水泥上行走。
9.
He attacked this wall, cemented by the hand of time . 他进攻这道被时间之手封闭了的墙。
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