Fatal road accidents have decreased in frequency over recent years.
近年来致命交通事故发生率已经下降。
英语解释:the rate at which sth happens or is repeated 发生率;出现率;重复率:
,
Fatal road accidents have decreased in frequency over recent years.
近年来致命交通事故发生率已经下降。
英语解释:the rate at which sth happens or is repeated 发生率;出现率;重复率:
,