词汇讲解：
1. liquid n. 液体
例句：Oil, milk and water are all liquids.
油、牛奶和水都是液体。
2. orbit v. 在…轨道上运行, 环绕轨道运行
例句：The man-made satellite orbits the earth every 48 hours.
那颗人造卫星每48小时绕地球轨道运行一周。
3. hemisphere n. 半球；地球的半球
例句：This animal is to be found only in the Southern Hemisphere.
这种动物只有在南半球才能找到。
4. disappear vi. 不见, 消失
例句：A ship disappeared below the horizon.
船消失在地平线下。
5. potential n. 潜力, 潜势, 可能性
例句：This new invention has an enormous sales potential.
这项新发明有巨大的销售潜力。
6. explode v. (使)爆炸
例句：The bomb exploded.
炸弹爆炸了。
7. bumpy adj. 崎岖的；不平的；颠簸的
例句：It was a bumpy ride along the farm track.
去农场的小路颠簸不平。
8. bulge n. 膨胀, 肿起
例句：The apple made a bulge in his pocket.
苹果把他口袋塞得鼓了起来。
9. fold v. 折叠; 对折交叠
例句：A fan folds.
扇子可以折叠起来。
10. bug n. 虫子
例句：The sacks of rice were swarming with bugs.
一袋袋的米里长满了虫子。
11. signal n. 信号, 暗号
例句：Signals are made with flags or lamps.
用旗或灯传递信号。
12. bury vt. 掩埋, 埋藏
例句：The old man is burying his money.
老头正在埋藏他的钱。
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