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来源:雅诚德英语网
When nutrients are used over and over in the environment, we call that a nutrient cycle.
当营养物质在环境中被反复使用时,我们称之为营养循环。
When nutrients are used over and over in the environment, we call that a nutrient cycle.
当营养物质在环境中被反复使用时,我们称之为营养循环。