数据库语言包括___、___两大部分,前者负责描述和定义数据库的各种特性,后者说明对数据进行的各种操作。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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