单词：simple machine
simple machine的用法和样例：
例句
- Levers and pulleys are simple machines.杠杆和滑轮是简单机械。
- We used the digital camera to take a short movie clip of our simple machine in action.我们使用数码相机拍摄了运转中的简单机械的简短电影剪辑。
- machine机器
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