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1.The new car has a direct-drive gearbox, which makes it more efficient.
这款新车配备了直接驱动的变速箱，使其更加高效。
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2. The old machine used to have a direct-drive gear, but it was replaced by an automatic transmission.
这台旧机器曾经有一个直接驱动的齿轮，但现在已经被自动变速器取代了。
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3.The engineer designed the gear for the new machine, ensuring that it could operate directly without any need for manual adjustments.
工程师为新机器设计了齿轮，确保它可以直接运行，无需任何手动调整。