Arcus venosus juguli
[医] 颈静脉弓
🧩 词语组成解析
[医] 弓
[医]静脉的
🗣️ 情景例句
I know so.
我确定知道是这样。
Karl must concentrate on his work.
卡尔必须集中精力于自己的工作。
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，