英虞湾的天光海色浑然相融，熠熠生辉。海面上漂浮着的珍珠筏银光闪闪，像钢琴的钢丝弦一样。
Ying Yu Bay sea sky color without blending, shine. Silver Pearl sea floating raft is shining, like a string like piano wire.
任何一个无外力而能自由振动的系统就是一个反例，譬如钢琴中的一条钢丝。
Any system capable of a free vibration without external force is a counter example, e. g. a wire in the piano.
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