原油形成于弱还原和淡水或微咸水环境；
The crude oils were formed under weak reducing and fresh water environments.
锌阳极即使在微咸环境中也会产生类似的问题，但是铝在河口和其它不明确的微咸水环境中也会继续有效运转。
Zinc Anodes suffer a similar problem even in brackish conditions whereas Aluminum will continue to operate effectively in river estuaries and other areas of brackish water indefinitely.
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