工具机；售后服务；限制理论；虚拟实境。
Machine Tool; After-sales Service; Theory of Constraint; Virtual Reality.
根据爱因斯坦的理论，光的速度变成了一种终极的速度限制。
Under Einstein's theory, the speed of light becomes a sort of ultimate speed limit.
此限制通常是理论上的限制。
这种局限既是由当时的历史语境决定的，更主要是受其理论自身的限制。
The limits are made by the temporal history context, mostly by the theory itself.
这种局限既是由当时的历史语境决定的，更主要是受其理论自身的限制。
The limits are made by the temporal history context, mostly by the theory itself.
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