Pbl
[医][=peripheral blood leucocyte]外周血白细胞
🗣️ 情景例句
Yeah. Quite a bit different.
是啊， 相当不一样。
I don't know where I've seen him before.
我不晓得在哪儿见过他。
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.
历史学家迄今认为日历是随农业的问世而出现的，因为当时人们面临着了解四季的实际需要，