R.r.
[医] 里瓦·罗契氏血压计, 水银血压计
🗣️ 情景例句
No, no, no. I like the aisle seat better.
不 不 不。我喜欢坐在靠过道的地方。
I did work this afternoon.
我今天下午工作。
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，