单击下箭头，然后单击现有连接。

Click the down arrow, and then click an existing connection.

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单击该属性，然后单击出现的下箭头。

Click the property, and then click the down arrow that appears.

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可以单击下箭头，以指定要使用的数据。

You can click the down arrow to specify the data that you want to use.

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Most of the time, when we deal with vectors, we don't draw these arrows anymore.

多数情况下,当我们处理矢量时,就不再画出这些箭头了

耶鲁公开课 - 基础物理课程节选

Now I'm hitting the down arrow.

先在我敲下箭头键。

哈佛公开课 - 计算机科学课程节选