Corn is a prime source of feed for dairy cattle and the rising costs could force farmers to reduce their herds, leading in turn to reduced supplies.

玉米是乳用牛饲料的主要来源，价格上涨将迫使农民减少饲养牲口数，进而导致供给减少。

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The attic is a prime source for heat and cold air exchange.

阁楼是冷热空气交换的源头。

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Intestinal bacterial translocation is the prime source of pancreas infection.

胰腺感染细菌的来源主要是肠道细菌的移位。

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As the chart shows, business investment has been the prime source of growth during America's expansion.

ECONOMIST: Bear necessities

More importantly the prime source of revenues for both companies is online advertising.

FORBES: Move up http://i.forbesimg.com t Move down

The second thing: Everybody sees energy as a prime source of growth in the future, and we're already slipping behind.

WHITEHOUSE: The White House