在城里还是骑三速自行车比较简单和可靠。
Three speed cycles are simple and reliable to ride around the town.
采用优质材料制造，三速开关，任意调节空气流量，操作灵活。
Using quality materials, three-speed switch, any adjustment of air flow, flexible operation.
如果一切顺利，明年夏天将有6000辆有内置照明系统的深蓝色三速折叠式自行车呼啸在伦敦的大街小巷。
If all goes well, 6, 000 navy blue, three-speed, sit-up-and-beg bikes with an inbuilt lighting system will be whizzing around the capital's streets next summer.
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