calculating rule

• 计算尺

calculating rule的用法和样例：

例句

1. The computer has supplanted the slide rule.
   计算机取代了计算尺。
2. One handy example of how classroom practices can change is the replacement of the slide rule by the pocket calculator.
   能够怎样改革课堂实习的一个简便的事例是用袖珍计算器代替计算尺。