In a recent study, Carrell and collaborators examined the spread of fitness habits in students at the Air Force Academy.

在最近的一项研究里，卡雷尔和合作者研究了空军学院学生健身习惯的传播。

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But natural selection is a powerful force, and if the spread of the disease means they have to be used widely, a resistant strain of the virus could easily evolve.

但是自然选择是一种强大的力量，而如果疾病的传播意味着这些药物将被广泛使用的话，一种具有抗药性的病毒毒株可能将轻易地进化出来。

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This Task Force is responsible for managing integrated action to control the spread of the disease and to decrease the impact on human and animal health.

该专题小组负责管理综合行动，以控制疾病传播并减少对人畜健康的影响。

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The force of the crash spread material from deep inside the moon.

VOA: special.2009.07.29

"Let's go from here," he said "Let's scrap the bill. Let's build health care reform that respects the limited government and liberty of the American people, so help us God!" Grassroots conservatives, many of them members of the so-called Tea Party movement, are out in force at the rally, eager to spread their anti-Obama, anti-tax,anti-big government message.

VOA: standard.2010.03.18

When a player gets hit, the Kevlar fibers stretch and spread the force evenly across the surface, suppressing the shock.

FORBES: Meet The Bullet-Resistant Sports Clothes Breaking Your Fall

In fact, Bejan and his colleagues found that interactions between the hand and the water when the fingers are slightly spread increase the total force a swimmer can exert, translating to faster times in the pool.

MSN: Fastest swimmers make webbed hands out of water

Signaling may also be one force behind the spread of voluntary CSR reporting.

FORBES: What Do We Make Of CSR Reporting?