B、As we all know that has no harm to human, whereas it can accelerate for sleeping.
B、As we all know that has no harm to human, whereas it can accelerate for sleeping.
对人体无害性早已众所周知，反之有促进睡眠的作用。
B、As we all know that has no harm to human, whereas it can accelerate for sleeping.
对人体无害性早已众所周知，反之有促进睡眠的作用。