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。
The multiple elastic scattering of photon can effectively enhance the gain length.
光子和散射颗粒的多次弹性散射可以增大有效增益长度。
The elastic wave gain is easy, inspires using the hammer firing, the operation is simple.
弹性波的获取容易，利用锤击发振，操作简单。
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