because its complicated its complex
因为它很复杂，很复杂
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Block complex reservoir is becoming the focus of work in exploration and development of Liaohe oilfield because its structure is complicated and its sedimentary facies change fast.
复杂断块油气躲因其构造复杂、沉积相变快而成为辽河油田勘探开发的工作重点。
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