公母端内孔平齐的设计使得油气在传送过程中不会发生紊流现象，减小传输阻力。
The design of flush inner holes at male and female ends enables the oil gas not to be subject to turbulence in the transmission process, and reduces the transmission resistance.
这个悬臂结构只有一端固定；所谓分形，就是指能够分叉成多个部分的结构，每个子结构与母结构是大体近似的。
A cantilevered beam is anchored at only one end; a fractal is a shape that can be split into parts, each of which is a smaller, though sometimes not exact, copy of the larger structure.
主开关主开关是在母排输入或输出端的线路断路器，所有的电流都要从那通过。
Main breaker a main breaker is a circuit breaker at the input or output of the bus, through which all of the bus power must flow.
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