1. The carbon content of mild steel is much lower than cast-steel. 
   软钢的含碳量要比铸钢的低得多。
2. having four equal sides and four right angles or forming a right angle. 
   有四等边四直角的或构成一个直角。
3. the unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees). 
   国际单位制采用的平面角单位；长度等于半径的弧所对的圆心角。
4. A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately57=17?4.6". 
   弧度平面角的一种衡量单位，其大小为长度等于半径的弧对的圆心角，1弧度角约等于57＝17?44。6＂
5. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions. 
   光通量单位等于一国际烛光照射在距离为一厘米面积为一平方厘米的平面上的光通量。

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