Whatever time forward or backward operation, most of the laws of physics can normal applications, but the second law of thermodynamics except.
无论时间向前或向后运行，大多数物理定律都能正常应用，但热力学第二定律除外。
You can maintain backward compatibility by creating a new operation based on the old one and keeping both in the interface.
可以通过基于旧操作创建新操作，并同时保持两个接口来保持向后兼容性。
Many backward production facilities that should have been closed down are still in operation.
不少应该淘汰的落后生产能力还没有退出市场。
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