（2）可导出条件（The condition of derivability）。一个理论T2要还原为理论T1，必须要求T2的所有规律由T1的规律以及相关的桥接原理逻辑地推导出来。
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从信息的分布模型，导出了信息的可测条件。
From the model, the measurable condition of information is derived.
推导出了中等稳定顶板条件下计算支护系统所需阻力和可缩量的公式，并进行了相应的模拟实验研究。
The formula of calculation of support system resistance and yieldability under condition of medium stable roof is derived and proved through eguivalent model testing.
在透声界面附近运用声学基本方程可导出边界条件的时域有限差分(FDTD)表达式。
From the basic equations in acoustics, boundary condition expressions on penetrable interfaces between media can be derived for the finite difference time domain (FDTD) method.
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