在以下示例中，第2行的文本被替换为新的文本行。
In the example below, the text at line 2 is replaced with new line of text.
将光标置于文本行的行首，然后按 Ctrl+4。
Position your cursor at the beginning of a line with text, and then press Ctrl+4.
将光标置于文本行的行首，然后按esc，从而将光标置于命令行中。
Position your cursor at the beginning of a line with text, and then press Esc, which will place the cursor in the command line.
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