...east once in their lives, but those who are sleep deprived are more likely to have panicked episodes of sleep paralysis that are usually accompanied by hallucinations, as well. 老师,请问as well前面为什么要加逗号,可以省略逗号吗?谢谢
请教各位老师:【句子】Relaxation and recreation, which are considered to
be an indispensable element of life. 这里的主语不是relaxation和recreation两个吗,为什么要在element之前用an修饰?