模式中通常仅出现一次的组件没有数量调节按钮。
Components that typically appear only once in a pattern do not have quantity spinners.
这个按钮是调节音量的。
他注意到，直接用手调节收音机的旋钮来调整声音要比按住专用按钮再说“收音机——调大音量”要来得快得多。
It is much quicker to turn up the radio's volume control by hand than it is to press a special button and say "radio-raise volume," he notes.
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