这对我们来说是一个解决方案——让鸟类来做这项工作既便宜又有效——它可以让脆弱的橡树和松树有机会真正“像树一样生长，然后老去”。
It's a solution for us—getting birds to do the work is cheap and effective—and it could give vulnerable oaks and pines the option to truly "make like a tree and leave."
接下来的问题是志愿者做的怎样的工作具有科学角度的有效性。
Then there is the question of ensuring that what the volunteers do is scientifically valid.
你的工作是否是那种在家里做会更有效率的？
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