Backup your database after migration completion, as shown in step 1 of the Pre-migration section.
迁移完成后，对数据库进行备份，如预迁移一节中的步骤一所示。
2
Some libraries even include pre-built auto-completion functions, as you might have seen on the Google search engine, where typical search queries are suggested as you type.
一些库甚至包含预建的自动完成功能，如您在 Google 搜索引擎中所看到的，在输入时会出现常见搜索项。
3
General Atomics of San Diego has funded the pre-conceptual design, which is underway and scheduled for completion in August.