就我研究的种类——斑胸草雀——而言，它们终其一生只有一位伴侣。因此，对它们来说如何辨认伴侣的声音非常重要。

"In the species that I study, the zebra finch, they make lifelong couples, and it's very important for them to recognize their mate," he says.

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但就在这个时候，温斯顿发现了脚下峭壁缝隙里有几株千屈草，其中一株有两种颜色，洋红色和砖红色，一看就知道是同根生的。

But at this moment Winston noticed some tufts of loosestrife growing in the cracks of the cliff beneath them. One tuft was of two colours, magenta and brick-red, apparently growing on the same root.

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生草栽培正是解决这一问题的有效途径。

Sod-culture is the effective way to solve this problem.

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