racing drivers have reached speeds over 600 miles an hour.这里为什么是speeds而不是speed?

racing drivers have reached speeds over 600 miles an hour.这里为什么是speeds而不是speed? 英语翻译Among them is Sir Malcolm 's son,Donlad ,one of the racing drivers who have exceeded the old record whose car was called Bluebird. He is one of the racing drivers who have exceeded the old record.His car was called BLUEBIRD.上面这两句话用among them .whose怎样连接? reached speeds over 600miles an hour.speed为什么要加复数?这是整句。since that time,racing drivers have reached speeds over 600 miles an hour. Cost drivers怎么翻译Cost drivers do not have a dominant impact in the industry. These drivers have brokrn the r____是road 还是roads? Peter and his father have got some nice model racing cars.（have got some 提问） racing是什么意思 RACING TEAM Peter and his father have got some nice model racing cars.(划线提问） motor racing和dog-racing是什么意思 Drivers must have more than a year's worth of driving experience.worth of怎么理解? it appears you do not have the latest display drivers for your graphics card. 翻译：Something will have to be done to keep drivers like you off the road. because most car have radios ,ads b____via radio can reach a lot of drivers very easilyRT horse racing是什么意思 racing toward翻译 TANKED RACING怎么样