Huxley speculated that a coat of hair would insulate against loss of body heat and might streamline the body to reduce drag in flight.

赫胥黎推测，一层毛发可以隔离身体热量的流失，并可能使身体呈现流线型，以减少飞行中的阻力。

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A: the autonomic nervous system USES the hormone adrenaline, a neurotransmitter, or chemical messenger, to send signals to various parts of the body to activate the fight-or-flight response.

答：这套自动神经系统利用肾上腺激素(一种神经递质，或者称为化学信使)把信号发送到身体的各个部分，以便激活“斗争还是逃避”反应。

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The team is also preparing a second hybrid wing body aircraft, the X-48C for future flight tests.

该团队也在设计第二架机翼机身混合飞机，即X - 48c，为未来的飞行测试做准备。

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However, subtle changes to their body chemistry caused by space flight may place them at greater risk if they undergo medical treatment back on Earth.

BBC: 'Hidden health risks' of space travel

And that's a great question because one of the hard things about long-duration space flight is the human body dealing with weightlessness and a lack of gravity.

WHITEHOUSE: President Obama's call to the International Space Station

Lee and Yun theorize that anti-inflammatory drugs counteract the body's self-destructive response to heart failure by decreasing the body's fight-or-flight response.

FORBES: Rethinking Biology