词汇讲解：
1. invent vt.发明; 创造
例句：Edison invented the electric light.
爱迪生发明了电灯。
2. character n. (书写或印刷)符号;(汉)字;字体
例句：He wrote in italic characters.
他用斜体字书写。
3. trundle v. (使)沉重地滚动;(使)移动
例句：The fruit seller trundled his cart along the street.
卖水果的小贩推着他的车子在街上艰难地走着。
4. mount v. 固定在...上;镶嵌;裱贴;装有
例句：The specimens have been classified and mounted.
标本已分类并固定在标本架上。
5. signal n.信号, 暗号
例句：Signals are made with flags or lamps.
用旗或灯传递信号。
6. vehicle n. 交通工具, 车辆
例句：No vehicles are permitted into the park.
公园内禁止任何车辆进入。
7. puzzle vt.使迷惑, 使难解
例句：The letter puzzled me.
这封信使我迷惑不解。
8. maiden adj. 首次的, 初次的
例句：The aircraft makes its maiden flight tomorrow.
这架飞机明天首航。
9. dip vt. 浸, 蘸
例句：Dip your pen.
将你的钢笔蘸一下。
10. distract vt.使(人)分心, 分散(注意力)
例句：Noise outside distracted her mind from her studies.
门外的噪音使她心神不宁, 无法集中注意力学习。
11. fade vi. 逐渐消失; 褪色
例句：His hopes faded.
他的希望破灭了。
