Imagine that you have a pendulum in outer space, that there is no gravity, nothing.
加上在外太空，有一个钟摆，那里没有重力，没有。
The pendulum hanging aside is turned into a lamp not only decorates the passage but infuses the space with time elements.
垂挂一旁的钟摆则化为灯盏，用以妆点廊道空间的同时，更让时间化为分秒因子充斥于空间中。
The forced vibration of pendulum is described by four-dimensional phase space and the fourth order autonomous ordinary differential equation.
本文用四维相空间和四阶自洽常微分方程描写了单摆的受迫振动。
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