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英语作文 英语作文的基本要求: 首先,一个段落必须有一个中心即主题思想,该中心由主题句特别是其中的题旨来表达。整个段落必须紧扣这个主题(stick or hold to the topic),这就是段落的统一性(unity)。其次,一个段落必须有若干推展句,使...

There are a lot of high buildings(buld) in this large city. I ofen do some shopping(shop) on sundays. Do you have(have)any classes in

- Primary identifier in child entityChecking relationship ...- Relationship name uniqueness- Relationship code uniqueness- Reflexive dependency...

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