有熊猫活动的惟一证据就是它们在雪中的足迹。

The only evidence of pandas was their tracks in the snow.

《柯林斯英汉双解大词典》

在此十多年前，足迹一向被视为重要证据，沃德用一只牛奶盘小心的将足迹盖住，防止被开始升腾的雾霭所破坏。

Decades before footprints were generally recognized as important evidence, Ward carefully covered them with a milk pan to shield them from the fine mist that had begun to fall.

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