Exchange risk is simple in concept: a potential gain or loss that occurs as a result of an exchange rate change.

从概念上说，外汇风险十分简单：汇率变化可能带来的损失或收益。

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Hence, the loss of gravitational potential energy of the block equals the gain of elastic potential energy of the spring.

因此，该物块的重力势能的减少，等于该弹簧的弹性势能的增加。

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Hence, the loss of gravitational potential energy of the block equals the gain of elastic potential energy of the spring.

因此，该物块的重力势能的减少，等于该弹簧的弹性势能的增加。

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