Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。
新概念英语第四册 Lesson 19 The stuff of dreams

📚 句中词汇解析

从本句中提取的重要词汇

nature ['netʃɚ] 词频1 词根: 出生
n. 自然;天性;天理;类型;
💡 nat出生的+ure状态→出生状态→天性
"the adversarial nature of the two-party system"
两党制的对抗性
近义：milieu, surroundings, circumambiency, medium, ecosystem, environment
literally ['lɪtərəli] 词频3 词根: 文字
adv. 逐字地;照字面地;确实地，真正地;[口语]差不多，简直（用于加强语意）;
💡 literal(文字的)+ly(副词后缀)→逐字地；实在地
"He translated the passage literally."
他逐字逐句地翻译这段文字.
近义：sic, textually, verbatim 反义：imaginatively, metaphorically, creatively
going ['gəuiŋ] 词频1
n. 出行，离去;出发;行为;工作情况; adj. 活着的，现在的;进行中的，营业中的;现行的;流行中的; v. 进行(go的现在分词);
"I would strongly advise against going out on your own."
我要极力奉劝你别单独外出。
近义：leaving, parting, withdrawment, departure, egress, exit 反义：appearance, appearing, imminence, approach, approaching, assistance
years
n. 年代；岁月；年；年龄
近义：summers
speculations
n. 投机买卖( speculation的复数形式 ); 思考; 投机活动; 推断

📚 更多「新概念英语第四册」例句

The further off this solid obstruction, the longer time will elapse for the return of the echo.
固体障碍物越远。回声返回所用时间就越长。
with their fellow scientists either in other countries or in universities,
和其他国家、其他大学同行们
Whether it be bird, fish or beast, the porpoise is intrigued with anything that is alive.
海豚对凡是活的东西都感兴趣，不管是鸟、是鱼，还是野兽。
The real dividing line between continents and oceans occurs at the foot of a steeper slope.
大陆和海洋的真正分界线是在陡坡脚大陆架慢坡
If our educational system were fashioned after its bookless past we would have the most democratic form of 'college'imaginable.
如果我们的教育制度仿效没有书籍的古代教育，我们的学院将具有可以想像得出的最民主的形式了。
The captive elephant, still roped to a tree,
捕来拴在树上的大象，