Suffice it to say that because a real-world RDBMS frequently contains data that needs to be preserved, just dropping the schema and rebuilding it from DDL statements is not an option.
可以说，由于现实中的RDBMS常常包含需要保留的数据，仅仅删除模式然后通过DDL语句重新构建模式不是正确的选择。
It's been a lot of progress, and rebuilding since Katrina hit, but most people agree there's still a lot of needs of doing.
而自从飓风袭击以来，在重建上已经有了很大进步，但是大多数人同意还有很多需要做的。
It needs substantive money and rebuilding railway is complex. It is difficult to rebuild some railways in our country.
此外，线路的改造也很复杂，而目前我国一些线路受条件限制难以改造。
It needs substantive money and rebuilding railway is complex. It is difficult to rebuild some railways in our country.
此外，线路的改造也很复杂，而目前我国一些线路受条件限制难以改造。
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