Ungeared
无齿轮啮合的
🗣️ 情景例句
They're here!
他们到了。
To teach how to drive a car
教人驾驶汽车
Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。