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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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 and modest price increases.

玉米是乳品牲口饲料的主要来源。价格上涨将迫使酪农减少饲养牲口数，导致供给减少，价格略增。

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Your concern is the source of our work force.

您的关注，是我们工作的源动力。

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Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

耶鲁公开课 - 基础物理课程节选

Slightly more than half of the work force is in agriculture, but services are the major source of economic growth, accounting for more than half of India's output, with only one-third of its labor force.

FORBES: India

The insidious double standard remains, with no sign of abating: the Fed, the main source of so many of our current financial woes, is still seen by most as a force for good in the world, as a prescient and astute regulator dedicated to systemic safety and soundness.

FORBES: An Overleveraged Fed Punishes Better-Capitalized Banks

The force helicopter was scrambled to find the source of the beam.

BBC: Green laser