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Your safety belt must be fastened whenever the seat belt signs are on.
当安全带指示亮着的时候你必须系好安全带。
youdao
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Seat belt must be in good condition and fastened while in motion.
机动车辆上的安全带必须状态良好，车辆运转时应系好安全带。
youdao
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Seat belt must be in good condition and fastened while in motion.
机动车辆上的安全带必须状态良好，车辆运转时应系好安全带。
youdao