R-fvalue
[化] R-f值; 比移值
🗣️ 情景例句
And I don't have to make a quick decision.
而且我也不需很快下决定。
The place is too stony for farming.
这地方太多石块，不适合耕种。
He could not wash himself or get dressed.Instead, his sister or his parents had to help him.
他自己不能洗澡或穿衣服，他的姐姐或父母亲就只好帮他的忙。