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相关词汇clock n. 时钟，计时器clock face 钟面clockwork n. 发条装置cylindrical adj. 圆柱形的，圆柱体的gearing n. 传动装置gnomon n. 指时针，日晷hourglass n. 沙漏interval n. 间隔invention n. 发明，发明物measure v. 测量，计量mechanical adj. 机械的pendulum n. 钟摆pour v. 倒，倾泻quartz n. 石英register v. 记录shadow n. 影子，阴影sundial n. 日晷，日规timepiece n. 计时器，钟，表track v. 追踪watch n. 手表情景对话:A: I"m going on a scuba-diving trip, so I need to buy a water resistant watch. Any idea where I can get one?B: Yes. I know exactly the place. It"s a store not far from here, where all kinds of timepieces are being sold.A: Really? I can"t wait to go there.B: Come on, be patient. We need to finish today"s work first.But I have to say that"s definitely the place you can get any timepiece you want. From the ancient hourglasses to the modern quartz clocks, you just name it!A: Wow.B: And they sell sundials, too.A: Well, I know hourglasses, in which fine sand pours through a tiny hole at a constant rate and indicates a predetermined passage of an arbitrary period of time. But how do sundials measure the time?B: Sundials were very widely used in ancient times. I think the design is like this: the sun casts a shadow onto a cylindrical stone and in this way, sundials tracks the sun continuously, registering the time by the shadow position of its gnomon.A: These are really among human"s oldest inventions. I can"t help thinking how smart our ancestors were.参考译文:A:我打算外出去潜水，所以需要买一块防水手表。你知道在哪儿有卖的吗?B:我正好知道这么个地方。离这儿不远有家商店，里面有各种各样的钟表等计时装置出售。A:真的呀?我都迫不及待想要去了。B:别急，耐心点.我们得先完成今天的工作。不过，我还是忍不住要告诉你.在那个商店里你想买任何计时装置铁定都能买着。不管是古代的沙漏，还是现代的石英钟.只要你想得到的里面都有!A:哇!B:他们还卖日晷呢。A:嗯，沙漏我知道的，它里面的细沙以恒定速度通过一个小孔漏出。由于有预先设定的刻度，就可以指示出任意一段时间了。但日晷是怎么来计时的呢?B:古时候很多地方都广泛使用日晷计时。我想它的设计原理可能是这样的:让太阳在圆往形石块上投射下阴影，这样就可以持续追踪太阳位置，通过阴影在其上面的不同位置来记录时间。A:这些计时装置都算得上是人类古老的一些发明了。我不禁在想咱们的祖先真是太聪明了!