这件衬衫的袖口上有个精美的旋钮。

There's an elegant ___knob on the cuff of this shirt.

这扇门的把手上有几个精美的黄铜装饰钮。

The door handle has several elegant brass ___knobs as decorative elements.

顺时针旋转这个按钮可以启动机器。

Turn the ___knob clockwise to start the machine.