如果一个对象不能通过跟踪根树来找到，那么对象是不可到的，它可以被GC再生。

If an object cannot be found by tracing the root trees, then that object is unreachable and therefore can be reclaimed by the GC.

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佛罗里达大学的农业经济学家霍金斯跟踪可再生能源领域的动态已经有20多年的时间了。

Alan Hodges, an agricultural economist at the University of Florida, has been following the renewable energy field for more than 20 years.

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通过跟踪研究经过基因改造的蝾螈的单个细胞，对于它们失去的肢体再生这种貌似神奇的能力，研究人员找到了一个出乎意料的解释。

By tracking individual cells in genetically modified salamanders, researchers have found an unexpected explanation for their seemingly magical ability to regrow lost limbs.

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