P-r interval
[医] P-R间期(心电图)
🧩 词语组成解析
🗣️ 情景例句
I will. Thanks, Dad.
我会小心的。谢谢你，爸爸。
Two ears to one tongue, therefore hear twice as much as you speak.
两只耳朵对一舌，故应多听而少说。
small at first, narrowly contained within its banks,
开始很小，被紧紧地夹在两岸中间，