Conversation had run out after that and Seldon watched the structures of the Streeling Sector¹ as they passed. Some were quite low, while some seemed to brush the "sky." Wide crosspassages broke the progression and frequent alleys² could be seen.
At one point, it struck him that though the buildings rose upward they also swept downward and that perhaps they were deeper than they were high. As soon as the thought occurred to him, he was convinced it was true. Occasionally, he saw patches of green in the background, farther back from the Expressway, and even small trees.
He watched for quite a while and then became aware that the light was growing dimmer. He squinted³ about and turned to Hummin, who guessed the question.
"The afternoon is waning," he said, "and night is coming on."
Seldons eyebrows⁴ raised and the corners of his mouth turned downward. "Thats impressive. I have a picture of the entire planet darkening and then, some hours from now, lighting⁵ up again."
Hummin smiled his small, careful smile. "Not quite, Seldon. The planet is never turned off altogether--or turned on either. The shadow of twilight⁶ sweeps across the planet gradually, followed half a day later by the slow brightening of dawn. In fact, the effect follows the actual day and night above the domes⁷ quite closely, so that in higher altitudes day and night change length with the seasons."
Seldon shook his head, "But why close in the planet and then mimic⁸ what would be in the open?"
"I presume because people like it better that way. Trantorians like the advantages of being enclosed, but they dont like to be reminded of it unduly9

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1 sector
n.部门，部分；防御地段，防区；扇形
参考例句：
The export sector will aid the economic recovery. 出口产业将促进经济复苏。 The enemy have attacked the British sector.敌人已进攻英国防区。

2 alleys
胡同，小巷( alley的名词复数 )； 小径
参考例句：
I followed him through a maze of narrow alleys. 我紧随他穿过一条条迂迴曲折的窄巷。 The children lead me through the maze of alleys to the edge of the city. 孩子们领我穿过迷宫一般的街巷，来到城边。

3 squinted
斜视( squint的过去式和过去分词 )； 眯着眼睛； 瞟； 从小孔或缝隙里看
参考例句：
Pulling his rifle to his shoulder he squinted along the barrel. 他把枪顶肩，眯起眼睛瞄准。 I squinted through the keyhole. 我从锁眼窥看。

4 eyebrows
眉毛( eyebrow的名词复数 )
参考例句：
Eyebrows stop sweat from coming down into the eyes. 眉毛挡住汗水使其不能流进眼睛。 His eyebrows project noticeably. 他的眉毛特别突出。

5 lighting
n.照明，光线的明暗，舞台灯光
参考例句：
The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。 The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。

6 twilight
n.暮光，黄昏；暮年，晚期，衰落时期
参考例句：
Twilight merged into darkness.夕阳的光辉融于黑暗中。 Twilight was sweet with the smell of lilac and freshly turned earth.薄暮充满紫丁香和新翻耕的泥土的香味。

7 domes
n.圆屋顶( dome的名词复数 )；像圆屋顶一样的东西；圆顶体育场
参考例句：
The domes are circular or ovoid in cross-section. 穹丘的横断面为圆形或卵圆形。 来自辞典例句 Parks. The facilities highlighted in text include sport complexes and fabric domes. 本书重点讲的设施包括运动场所和顶棚式结构。 来自互联网

8 mimic
v.模仿，戏弄；n.模仿他人言行的人
参考例句：
A parrot can mimic a person's voice.鹦鹉能学人的声音。 He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。

9 unduly
adv.过度地，不适当地
参考例句：
He did not sound unduly worried at the prospect.他的口气听上去对前景并不十分担忧。 He argued that the law was unduly restrictive.他辩称法律的约束性有些过分了。

10 psychology
n.心理，心理学，心理状态
参考例句：
She has a background in child psychology.她受过儿童心理学的教育。 He studied philosophy and psychology at Cambridge.他在剑桥大学学习哲学和心理学。

11 relatively
adv.比较...地，相对地
参考例句：
The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。 The operation was relatively painless.手术相对来说不痛。

12 platinum
n.白金
参考例句：
I'll give her a platinum ring.我打算送给她一枚白金戒指。 Platinum exceeds gold in value.白金的价值高于黄金。

13 affixed
adj.[医]附着的，附着的v.附加( affix的过去式和过去分词 )；粘贴；加以；盖（印章）
参考例句：
The label should be firmly affixed to the package. 这张标签应该牢牢地贴在包裹上。 He affixed the sign to the wall. 他将标记贴到墙上。 来自《简明英汉词典》

14 suffused
v.（指颜色、水气等）弥漫于，布满( suffuse的过去式和过去分词 )
参考例句：
Her face was suffused with colour. 她满脸通红。 Her eyes were suffused with warm, excited tears. 她激动地热泪盈眶。 来自《现代英汉综合大词典》

15 gathering
n.集会，聚会，聚集
参考例句：
He called on Mr. White to speak at the gathering.他请怀特先生在集会上讲话。 He is on the wing gathering material for his novels.他正忙于为他的小说收集资料。

16 blindfold
vt.蒙住…的眼睛；adj.盲目的；adv.盲目地；n.蒙眼的绷带[布等]； 障眼物，蒙蔽人的事物
参考例句：
They put a blindfold on a horse.他们给马蒙上遮眼布。 I can do it blindfold.我闭着眼睛都能做。

17 blindfolded
v.（尤指用布）挡住（某人）的视线( blindfold的过去式 )；蒙住（某人）的眼睛；使不理解；蒙骗
参考例句：
The hostages were tied up and blindfolded. 人质被捆绑起来并蒙上了眼睛。 They were each blindfolded with big red handkerchiefs. 他们每个人的眼睛都被一块红色大手巾蒙住了。 来自《简明英汉词典》

18 faculty
n.才能；学院，系；(学院或系的)全体教学人员
参考例句：
He has a great faculty for learning foreign languages.他有学习外语的天赋。 He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。

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