R factors
[医] R因子, 叶酸
🧩 词语组成解析
n. 因素（factor的复数）
🗣️ 情景例句
Be our guest.
请随意。
Could you hold the door open, please?
请让门继续开着好不好？
I wish I had your will power.
但愿我有你的意志力。