核心问题
The specific gravity of a gas is the numerical ratio of its density with the density of a standard of reference, usually air. (TOEFL)
请分析上面的试题。
词典解答
应记住科技英语里的一个固定词组 the ratio of A to B(A 与 B 的比率)。
The ratio of load to effort is termed the Mechanical Advantage. 载荷与作用力之比叫做机械效益。
练习题
请做下面的英语试题： The ratio of the work done by the machine ____ the work done on it is called the efficiency of the machine. A. against B. with C. to D. for(全国六级,90.1-57)