If you need Band 6 - no need for complex sentence structure. If your goal is Band 7 - then show advanced sentence structure, language and vocabulary.
如果你的目标使6分，那就用一些不是很复杂的句子结构，但如果你想哪7分，那就用一些高级的句子结构、语言和词汇。
The major goal of microbial ecology is to study the structure and function of complex microbial communities.
对复杂环境中微生物群落结构和功能的研究是微生物生态学的重要任务。
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