看着它随着钟摆的摆动飞逝。
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。
By the 16th century, a pendulum clock had been devised, but the pendulum swung in a large arc and thus was not very efficient.
他现在只不过是一颗火热的心，被一团发光的云所包围，他像一个巨大的钟摆一样，在不可思议的摆动的弧线上摇摆。
Encompassed in a luminous cloud, of which he was now merely the fiery heart, he swung through unthinkable arcs of oscillation, like a vast pendulum.
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