By the 16th century, a pendulum clock had been devised, but the pendulum swung in a large arc and thus was not very efficient.
到了16世纪，人们发明了摆钟，但钟摆摆动的幅度很大，因此效率不高。
Most people think of this London landmark as Big Ben, but Big Ben is actually the name of the largest bell inside this pendulum clock.
大多数人都认为伦敦的标志是大本钟，其实大本钟只不过指的是威斯敏特宫的大摆钟里面的那个巨型铃钟而已。
His work in this direction was motivated by his interest in light and in the design of pendulum clock.
他对光线研究和钟摆设计的兴趣推动了他在这方面的工作。
His work in this direction was motivated by his interest in light and in the design of pendulum clock.
他对光线研究和钟摆设计的兴趣推动了他在这方面的工作。
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