劫车事件的发生率高达每天近50起。Car hijackings are running at a rate of nearly 50 a day.据报道，该矿事故发生率是全国平均水平的3倍。The mine reportedly had an accident rate triple the national average.医院中抗甲氧西林金黄色葡萄球菌感染病例不断增长的发生率rising rates of MRSA infectio...
His son was praised for speeches of remarkable fluency.他儿子因为发言流畅自然而得到了表扬。Fluency in French is required for this job.这个工作要求法语熟练自如。Some young children achieve great fluency in their reading.一些孩子小小年纪阅读已经非常流畅....