Speculations about is nature have been going on for literally thousands of years,
人們對睡眠作用的種種猜測，確實(shí)有數(shù)千年之久。
新概念英語第四冊
Lesson 19 The stuff of dreams
?? 句中詞匯解析
從本句中提取的重要詞匯
n. 自然;天性;天理;類型;
?? nat出生的+ure狀態(tài)→出生狀態(tài)→天性
"the adversarial nature of the two-party system"
兩黨制的對抗性
近義：milieu, surroundings, circumambiency, medium, ecosystem, environment
adv. 逐字地;照字面地;確實(shí)地，真正地;[口語]差不多，簡直（用于加強(qiáng)語意）;
?? literal(文字的)+ly(副詞后綴)→逐字地；實(shí)在地
"He translated the passage literally."
他逐字逐句地翻譯這段文字.
近義：sic, textually, verbatim
反義：imaginatively, metaphorically, creatively
n. 出行，離去;出發(fā);行為;工作情況;
adj. 活著的，現(xiàn)在的;進(jìn)行中的，營業(yè)中的;現(xiàn)行的;流行中的;
v. 進(jìn)行(go的現(xiàn)在分詞);
"I would strongly advise against going out on your own."
我要極力奉勸你別單獨(dú)外出。
近義：leaving, parting, withdrawment, departure, egress, exit
反義：appearance, appearing, imminence, approach, approaching, assistance