虚拟全书 > 介绍 > 笔记本界面的使用 > 二维表达式的输入 > 选择和删除表达式
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选择和删除表达式

选择下一层子表达式删除，以解构表达式

选择下一层子表达式

按住 Ctrl+. 选择下一层子表达式：

重复按下 Ctrl+.
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input

删除，以解构表达式

按 Del (或 Backspace) 删除表达式的内容，以解构表达式.

重复按住 Backspace
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input

另一个示例

重复按住 Backspace.
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
Click for copyable input
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