The magnetic field intensity of the solenoid used for travel wave tube and transport properties of electron beam in the slow wave system under its function is simulated with the electromagnetic code.

利用电磁场软件模拟了行波管电磁线包磁场，以及在电磁线包磁场作用下电子注在慢波系统中的运动特性。

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The decision of city planning authorities as to whether a sub-pavement or "tube" system should be adopted, depends a great deal on what type of public transport system already exists.

城市规划部门决定建造地下道还是建造地铁，主要取决于公共交通系统的现状。

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