本文讨论线性时不变系统的块解耦问题。

The block decoupling problem for linear time-invariant systems is discussed.

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前已指出：我们主要关心的是用线性、时不变微分方程作为实用的模型系统。

We have already stated that our main concern will be the study of systems for which linear, time-invariant differential equations provide a useful model.

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CD MA系统按信道模型的不同分为高斯白噪声信道和衰落信道、时变和时不变信道。

According to different channel models, CDMA systems can be divided into additive white gaussian noise (AWGN) channel and dispersive channel, time-variant and time-invariant channel.

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If I place my container of gas on the table here, and I come back an hour later, the pressure needs to be the same when I come back Otherwise it's not equilibrium.

如果我把装气体的容器放在桌子上，一小时以后我再回来时,气体的压强应该是不变的,否则它就不是平衡的。

麻省理工公开课 - 热力学与动力学课程节选

So what I'm doing here is I'm cooling, and then when I'm sitting at a fixed volume and I'm increasing the pressure, what am I doing? I'm heating, right?

对了，因此在这里，需要冷却,而在这里，当体积不变增加压强时？

麻省理工公开课 - 热力学与动力学课程节选

That's another way of saying maintaining velocity if it's not acted upon by a force.

这就是不受外力作用时,速度保持不变的另一种说法

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