As a reasonable guess, they might, on an average, be 100 light years away.
据合理推算，外星人离我们平均距离也有100光年之远
新概念英语第四册
Lesson 43 Are there strangers in space
📚 句中词汇解析
从本句中提取的重要词汇
adj. 合理的，公道的;明白道理的;适当的;有理性的;
💡 reason合理+able形容词后缀, 具有某种性质的 → 合理的, 通情达理的
"There is reasonable concordance between the two sets of results."
两组结果之间有着合理的一致。
近义：intelligent, levelheaded, logic, logical, moderate, modest
反义：illogical, inane, inconsistent, irrational, mad, meaningless
adv. 离开，远离;在远处;消失;
adj. 不在的;遥远的;客场比赛;
💡 a(on)+broad→在远方；离去；不在
"In the hotel, the old men were drinking away as usual."
在旅馆里, 这些老人和往常一样喝个不停.
近义：abroad, out, outdoors, outside, without
vt. 推测;猜测，臆测;猜中;假定，认为;
vi. 猜，猜测;猜对;
n. 猜测;推断;
💡 联想：猜也猜不着“该死
"You'll never guess what's happened!"
你根本猜不到出了什么事！
近义：presume, sense, assume, suspect, speculate, suppose
反义：learn, miscalculate, misdeem, miss, confuse, fail
adj. 平常的;平均的;典型的;（价值、比率等的）平均数的;
n. 平均水平;（速度等的）平均率;平均估价;
vt. [数学] 计算…的平均值;调和，拉平;分摊;按比例（或平均）分配（利润等）;
vi. 平均：作为或达到一个中间值;维持（有利的）平均价格;
💡 aver(every每个)+age(后缀):- 平均的
"a rise in average earnings"
平均收入的增加
近义：curve, mean, median, medium, middle, midpoint
反义：appreciable, memorable, notable, noted, noticeable, notorious
n. 光;发光体;电灯;点火器;
adj. 轻的;明亮的;浅色的;少量的;
v. 点燃;照亮;用光指引;
adv. 轻地，轻装地;
💡 房间光线（light）明暗度正好（right）
"The office was light and airy."
办公室又明亮又通风。
近义：illuminate, illumine, lighten, brighten, ignite, incandescence
反义：quench, douse, extinguish, murk, murkiness, obscurity