The early system were known as open systems, because the oil-filler cap was open, or vented to the atmosphere.
早期的控制系统，就是人们所知道的“开式”系统，因为它的加机油管盖是开式的，或者说因其与大气连通。
The early system were known as open systems, because the oil-filler cap was open, or vented to the atmosphere.
早期的控制系统，就是人们所知道的“开式”系统，因为它的加机油管盖是开式的，或者说因其与大气连通。
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