已经认定很多麻醉品对身体和精神都是有害的.It is established that many drugs can be physically and mentally dangerous.目前最危险的违禁麻醉品之一是鸦片.One of the most dangerous illegal narcotics in use today is opium.鸦片归在麻醉品项内.Opium is classed under the head...
The mast, which was a solid spruce spar, bent like a bow, and for a moment I thought we were going to lose it.坚固的云杉木做成的桅杆已经弯得像一把弓，那一刻我觉得它马上就要断了。The rope, rod, or spar on which such a ring moves.环可供这种环移动的绳子 、 竿子或圆材.CIS: J...
The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.作者证实:单叶双曲面和双曲抛物面是直线曲面.The mathematical model of the hyperboloid twist drill was introduced.介绍了以旋转单叶双曲面作麻花钻钻尖后刀面的数学模型.The...