The middle classes also matter because they are natural swing voters.
中产阶层之所以有影响还因为他们是天然的可争取的选民。
The swing is a pendulum with a single natural frequency depending on its length.
秋千是只有一个固有频率的摆，此频率决定于它的长度。
The swing is a pendulum with a single natural frequency depending on its length.
秋千是只有一个固有频率的摆，此频率决定于它的长度。
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