Homeowners have been feeding wild birds for a long time, but only now are scientists finally beginning to understand just how that affects urban ecosystems.
房主们长期饲养野生鸟类，但只有现在，科学家最终才明白这是如何影响城市生态系统的。
Homeowners have been feeding wild birds for a long time, but only now are scientists finally beginning to understand just how that affects urban ecosystems.
房主们长期饲养野生鸟类，但只有现在，科学家最终才明白这是如何影响城市生态系统的。
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