And last year Khan Academy and the College Board unveiled a free course they say boosts SAT scores for students at all income levels.这里的黑体部分是插入语吗,如果是为什么没有逗号呢?如果不是那是什么成分?
One way is to teach people how to avoid catchingthe virus sexually through condom promotion.promotion可理解为倡导,但这个sexually我不理解,这句话从sexually到后面就不知道怎么翻译理解了,求助!
下面这两句话中的 over 分别是什么词性?为什么?So far in Wuhan, over 200 illegal wharves have been shut
down.the Wuhan
goverment have shut down over 200
illegal wharves so far.