seat belt must be fastened
... 必须戴安全帽 Head Protection Must Be Worn 必须系安全带 Seat Belt Must Be Fastened 安全检查 Security Check ...
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seat belt must be fastened
安全带必须系好
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
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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。
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