将投标分为两个基本组成要素是有用的。
It is useful to think of a bid as being made up of two basic elements.
同时，水资源也是生态环境的基本组成要素。
Meanwhile, the water resource is a fundamental element of the ecological environment.
在开始之前，你应该先了解一下剧本的基本组成要素及格式。
Before you even start, you have to learn the basic components of a good script and the correct format to write it in.
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