The "not used" field is always empty, so it's probably left over from a previous application and can be safely ignored.
“未用”字段总是空的，因此可能是以前的应用程序留下来的，完全可以忽略。
Even if the database is newly created and still empty, system tables and views are always present, so you can use them as follows.
即使数据库是新创建且仍然为空的，也总是会带有系统表和视图，因此，您可以按以下方法使用它们。
The house stood only a little way away from our home. Its garden was always neat and tidy, the crocuses and lilacs planted so carefully, the lawn so even and lush and yet, it seemed to stand empty.
那栋房子离我家不远，房前的花园是整齐干净的，上面精心种植着藏红花和丁香，草坪平坦而茂盛，而且似乎一直空无一人。
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