她单击调色板上的 Pool 图标并将其拖拽到画布上的一个空点上。

She clicks the Pool icon on the palette and drags it to an empty spot on the canvas.

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从社会角色来看，人是多种角色的综合体，而在某一时空点上，每个人只能选择一种话语角色进行言语交际。

Considering from social role, one is a synthetic unit of varied roles. But in certain space-time, everyone can choose only one role in communication.

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因此，远程表的定义允许列可以为空这一点非常重要。

Therefore, it is very important for the remote table definition to include column nullability.

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