The system is both practical and ecologically sound.
这个系统不但切合实际，从生态学观点来看也是合理的。
It is economical to run and ecologically sound.
它运行高效且有益生态。
Big trees are incredibly important ecologically.
大树对生态环境非常重要。
They might be ecologically valuable too.
它们在生态学上可能是非常有价值的。
Even if the stuff we do buy is "ecologically friendly".
即使我们购买的是“环保产品”。
Then there are the bacteria—familiar as agents of disease, but actually ecologically crucial.
接下来是细菌域，细菌作为传染疾病的媒介为人们所熟悉，但是实际上它们对于生态环境至关重要。
Then there are the bacteria—familiar as agents of disease, but actually ecologically crucial.
接下来是细菌域，细菌作为传染疾病的媒介为人们所熟悉，但是实际上它们对于生态环境至关重要。
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