这些志愿者都被要求嗅装有某一种气味或无味的油罐子，然后再按下按钮表示自己是否闻到什么了。

The participants were asked to sniff a jar containing either one of the three odours or the scentless oil, and then press a button to indicate whether they thought the jar smelled of anything.

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比如，Firefox使用按钮表示trigger，使用滑动条表示range，使用标准文件打开对话框表示upload控件。

For instance, Firefox USES a button for a trigger, a slider for a range, and a standard file open dialog box for an upload control.

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当用户读取包含附件的消息时，将在消息体的顶部显示一个按钮，表示作为附件添加的文件的数量。

When users read a message that includes attachments, a button displays at the top of the message body, indicating how many files are attached.

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