Levelman
n. 水平仪器操作员, 水平测量员
🗣️ 情景例句
OK.
好的。
Sleep well.
祝您睡好。
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，