一般不加逗号,除非期刊对引文格式有特别要求;etc.前面一般要加逗号;etc.里面的et就相当于and了,所以不要出现and etc.这样的用法。列举一串事物时,如果前面已有
This was a prospective, randomized,evaluator-blinded, split-lesion controlled, 2-arm trial。请园子大神们帮
最有效的手段之一——通风,正开始引起应有的关注。……'s role in the Covid-19 battle, the Biden administration announced a Clean
s disease up to 15 years before diagnosis: an agnostic study of French and British health records