Gets a visual style element that represents a downward-pointing sort arrow.

获取表示向下排序箭头的视觉样式元素。

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For example, if you want to show the stock market is going down, you might want to use a downward-pointing arrow that's also red.

例如，如果你想表示股市下滑，你可以使用一个向下指的箭头，同时标为红色。

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You use this downward pointing triangle as the notation for the gradient.

用▽表示,这就是梯度的符号。

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You use this downward pointing triangle as the notation for the gradient.

用▽表示,这就是梯度的符号。

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