Chapter 16

 The ringwall was not very large. Slowed by his vac-suit, a man might cover its diameter in half an hour. But Steve did not traverse the circular area. Instead, he climbed the ringwall laboriously¹ and then made his way down, tumbling and sliding, to the rocky floor of the shallow crater².

The voice came from within it—from within the crater. It could not be! He told himself that more than once. The rock of Ganymede itself might carry sound, but you'd feel it only as a throbbing³ through the soles of your boots, for the vacuum of space which encroached on all sides could not transmit sound-waves.

That was science. That was elementary. But the voice whispered in his ears, ebbing⁴ and flowing, first loud, then soft—and science be damned.

Charlie was calling. I am Charlie Stedman. I am Charlie Stedman—That was all, but it was enough. Charlie's name, and Charlie's voice.

"It can't be happening," Steve said, aloud, and heard his own voice roaring inside the helmet. It drove the other voice, the impossible voice, out for a moment, but it returned. Around the inner circumference⁵ of the ringwall Steve ran, seeking a source for the impossible. Sobbing⁶, stumbling, he plunged⁷ ahead. It was only when he returned to his starting point, a needle-like pinnacle⁸ of rock, that he realized his supply of air would be exhausted⁹ in three hours.

1 laboriously   

adv.艰苦地；费力地；辛勤地；（文体等）佶屈聱牙地

参考例句：

• She is tracing laboriously now. 她正在费力地写。 来自《简明英汉词典》
• She is laboriously copying out an old manuscript. 她正在费劲地抄出一份旧的手稿。 来自辞典例句

2 crater   

n.火山口，弹坑

参考例句：

• With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
• They came to the lip of a dead crater.他们来到了一个死火山口。

3 throbbing   

a. 跳动的,悸动的

参考例句：

• My heart is throbbing and I'm shaking. 我的心在猛烈跳动，身子在不住颤抖。
• There was a throbbing in her temples. 她的太阳穴直跳。

4 ebbing   

（指潮水）退( ebb的现在分词 )； 落； 减少； 衰落

参考例句：

• The pain was ebbing. 疼痛逐渐减轻了。
• There are indications that his esoteric popularity may be ebbing. 有迹象表明，他神秘的声望可能正在下降。

5 circumference   

n.圆周，周长，圆周线

参考例句：

• It's a mile round the circumference of the field.运动场周长一英里。
• The diameter and the circumference of a circle correlate.圆的直径与圆周有相互关系。

6 sobbing   

<主方>Ⅰ adj.湿透的

参考例句：

• I heard a child sobbing loudly. 我听见有个孩子在呜呜地哭。
• Her eyes were red with recent sobbing. 她的眼睛因刚哭过而发红。

7 plunged   

v.颠簸( plunge的过去式和过去分词 )；暴跌；骤降；突降

参考例句：

• The train derailed and plunged into the river. 火车脱轨栽进了河里。
• She lost her balance and plunged 100 feet to her death. 她没有站稳，从100英尺的高处跌下摔死了。

8 pinnacle   

n.尖塔，尖顶，山峰；(喻)顶峰

参考例句：

• Now he is at the very pinnacle of his career.现在他正值事业中的顶峰时期。
• It represents the pinnacle of intellectual capability.它代表了智能的顶峰。

9 exhausted   

adj.极其疲惫的，精疲力尽的

参考例句：

• It was a long haul home and we arrived exhausted.搬运回家的这段路程特别长，到家时我们已筋疲力尽。
• Jenny was exhausted by the hustle of city life.珍妮被城市生活的忙乱弄得筋疲力尽。