He explained how the two mechanisms worked.
他解释

机械装置是如何工作的。
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力最新机试真题 In the 17th, 18th, and 19th centuries, many mechanical calculators were developed, though with little success until the arrival of the arithmometer, a portable and reliable mechanical device that could add, subtract, multiply, and divide numbers.
在17、18和19世纪,开发了很多机械计算器,但在四则计算器到来之前几乎都没有成功,四则计算器是一种便携式且可靠的机械装置,可以对数字进行加、减、乘和除。