Definition [Cambridge Dictionary]

1. a long, narrow hole, especially one for putting coins into or for fitting a separate piece into. [狭缝；（尤指）投币口，狭槽]

2. an amount of time that is officially allowed for a single event in a planned order of activities or events. [（名单、日程安排或广播节目表中的）位置，时间，机会]

示例：

I put my money in the slot and pressed the button but nothing came out.

我把钱放入投币口，按了按钮，但没有东西出来。

Somebody else can take your slot.

别人可以取代你的位置。

He has a regular slot on the late-night programme.

他在深夜节目中有一档固定栏目。

Visitors can book a time slot a week or more in advance.

来访者们可以提前一周或一周以上预约一个时段。

补充：

slot machine 老虎机，有时简称为slot

time slot时间空挡；（电视或广播电台的）播放时段

key slot 键槽

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