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
Try putting him across your lap on his stomach.
试试让他趴着睡在你大腿上。
The school is two miles straight ahead.
那学校一直向前两英里。
In fact they grow better if you feed them.
事实上，要是你给它们浇水施肥，它们会长得更好。