Some scientists are trying to find out the 原因 for the haze weathe_英语解答

Some scientists are trying to find out the 原因 for the haze weather
原因cause 加不加s 不懂别回

人气：262 ℃　时间：2019-11-18 05:54:39

解答

既可加s,也可不加s.加s表示多种原因,不加s表示一种原因.