1. He brushed his hand over the smooth nob of the doorknob.
他用手轻轻拂过门把手上光滑的旋钮。

2. The nob on the top of the stove controls the temperature.
炉子顶部的旋钮控制着温度。

3. She turned the nob on the radio to find a clear station.
她转动收音机上的旋钮以寻找一个清晰的电台。

4. The nob on the faucet was broken, so water leaked out constantly.
水龙头上的旋钮坏了，所以水不断地漏出来。

5. He adjusted the nob on his guitar to get the perfect sound.
他调整吉他上的旋钮以获得完美的声音。

6. The nob on the flashlight was turned, but the light didn't come on.
手电筒上的旋钮已经打开，但灯光没亮。