P-r interval
[医] P-R间期(心电图)
🧩 词语组成解析
🗣️ 情景例句
One step at a time.
做事要一步一步来。
The two contestants are neck and neck with 20 points each.
比赛双方各得20分，打成平局。
Yes. The No.72 bus will take you there.
有。72路公共汽车会把你带到那儿。