日期:
来源:雅诚德英语网
However, it's in less developed countries that rotavirus causes the worst problems.
然而,在欠发达国家轮状病毒能引起严重问题。
However, it's in less developed countries that rotavirus causes the worst problems.
然而,在欠发达国家轮状病毒能引起严重问题。