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1·The quagga was a strikingly beautiful variant of the zebra.

白氏斑马是一种极其美丽的斑马变种。《柯林斯英汉双解大词典》

2·The Quagga was a southern subspecies of the Plains Zebra.

斑驴是南非草原斑马的一个亚种。

3·But recently the inland waterways, docks and fresh-water intakes of North America have been overrun by zebra and quagga mussels-species that originate from the area around the Black Sea.

但是，最近北美的内陆水道、码头和淡水入口蔓生了一种原存于黑海区域的斑马蛤贝和白斑马蛤贝。