R-r interval
[医] R-R间期(心电图)
🧩 词语组成解析
🗣️ 情景例句
Where can we find a good restaurant?
我们在哪儿能找到一个好餐馆？
If I had had time,I would have called you.
如果我有时间，我就打电话给你了。
The find of the century - Children aged 13 and 11 discover cave paintings.
“本世纪的重大发现--13岁和11岁的孩子发现了岩画”。