To find text within the whole document, open the Find & Replace dialogue box without any active text selection. If you want to search only a part of your document, first select that part of text, then open the Find & Replace dialogue box.
要在整个文档中查找文本，请打开“查找和替换”对话框，而无需选择任何活动文本。如果要仅查找文档的一部分，请先选择该文本部分，然后打开“查找和替换”对话框。