在研究玉米的基因构成时，芭芭拉·麦克林托克发现了一种新的突变基因，这一发现使人们对细胞分化有了更深入的了解。

While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.

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哈珀·柯林斯的一位发言人说，新的地图是以美国国家冰雪数据中心(NSIDC)提供的信息为基础。

A spokesperson for HarperCollins said its new map was based on information provided by the US National Snow and Ice Data Center (NSIDC).

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