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.
歷史學家迄今認為日歷是隨農業的問世而出現的，因為當時人們面臨著了解四季的實際需要，
新概念英語第三冊
Lesson 38 The first calender
?? 句中詞匯解析
從本句中提取的重要詞匯
n. 農業;農耕;農業生產;農學;
?? agri田地+cult耕種+ure表名詞→ 農業
"The number of people employed in agriculture has fallen in the last decade."
過去十年，農業從業人數已經下降。
近義：husbandry, agronomy, farming
vt.& vi. 懂，理解;
vt. 了解;默認;聽說;領會;
?? under(under)+stand→懂；了解；通曉；認為
"That's just an approximation, you understand."
你知道那僅僅是近似值。
近義：ideate, imagine, apprehend, interpret, assimilate, penetrate
反義：misapprehend, misconstrue, mishear, misinterpret, misrepresent, misread
adj. 假裝的;假冒的;假定的;被承擔的;
v. 取得（權力）( assume的過去式和過去分詞 );假設;假定;呈現;
"the assumed differences between the two states"
兩種狀況的假定區別
近義：hypothetical, implicit, implied, phony, presumptive, pretended
反義：apparent, irrefutable, manifest, obvious, ostensible, ostensive
n. 出現;到來;基督降臨節（圣誕節前的四個星期）;
"the advent of new technology"
新技術的出現
近義：imminence, approach, arrival, occurrence, coming, commencement
反義：launching, leaving, liftoff, outgoing, parting, takeoff
adj. 真的;真實的，現實的;事實上的;真誠的;
adv. 真正，實在;確實地;
n. 實在，現實;實數;
"I made a real balls-up of my exams."
我考試考得一塌糊涂。
近義：legitimate, authentic, sterling, true, truthful, unfeigned
反義：imaginary, utopical, visional, chimeric, chimerical, dreamlike