首先看这两题,比较的是主语的数量,所以省略了比较部分,而只保留了后面限制部分,这里我们把charge多少和enrolled的人数看成是对主语的限制部分,省略比较部分是因为不影响句意的情况下表达的简洁。 According to a 1996 survey by the National Association of College and University Business Officers, more than three times as many independent institutions of higher education charge tuition and fees of under $8000 a year as charge over $16000. According to a study by the Carnegie Foundation for the Advancement of Teaching, companies in the United States are providing job training and general education for nearly eight million people, about as many as are enrolled in the nation’s four-year colleges and universities. 再看这道题,比较对象是主语,但是比较的是emit pollutants的量,后面同样省略了比较部分,而保留了主语部分限制说明是谁emit。 Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than those burning gasoline or diesel fuel 由以上三题我们不难看出ETS在比较的时候往往会省略比较部分,而保留对比较的限制部分,从而在不影响句意表达的前提下,保持了表达的简洁。 |