P.-p. factors
[医] 抗糙皮病因子, 抗蜀黍红斑因子, 烟酸
🧩 词语组成解析
n. 因素（factor的复数）
🗣️ 情景例句
You're quite the artist!
你还真像个艺术家。
Happy is he that is happy in childhood.
童年时代快乐的人是幸福的。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某种作用。