Pbf
[医][=peripheral blood flow]外周血流（量），末梢血流量
🗣️ 情景例句
Really?
真的？
Is this your pen? I found it under the desk.
这是你的笔吗？我在桌下捡的。
But this does not matter, for, as he has often remarked, one is never too old to learn.
但这没有关系，因为正如他常说的那样，人要活到老学到老。