Moves the cursor to the beginning of the contents of the current cell. Press again to move the cursor to the first cell in the table. Press again to move the cursor to the beginning of the document.
将光标移到当前单元格内容的起始位置。再次按下可使光标移到表格中的第一个单元格。再次按下可使光标移到文档的起始位置。