Around 300 trains should be able to speed through the Gotthard's twin tubes every day, at up to 250 kilometers per hour (155 mph) for passenger trains, according to planners.
根据设计者的设计，将允许有每天大约300辆火车穿梭在圣哥达的双管隧道中，最高设计时速达250Km/h（155mph）。
The 2080 features bass-reflex tuning through twin port tubes providing optimal low-frequency tuning, enhancing the already substantial bass output from this high quality enclosure.
在2080功能低音反射通过双端口提供最佳的低频率调谐管调整，提高从这个高品质的外壳已经大幅低音输出。
Vehicle twin- photoelectrical pointing system mainly consists of reflex light-tubes, a autocollimation theodolite and modulators.
车载双联光电瞄准系统主要由折转光管、自准直经纬仪和相应的调制器组成。
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