气流通过机身的距离越长，它的速度就越快，会对发动机部件产生不必要的压力。
The farther the air is from the fuselage, the faster it moves. That can produce undesirable stress on an engine’s components.
处于家务和工作两条线的女性朋友更容易产生情绪压力，长时间的与电话，电子邮件，更容易使她们受到不必要的情绪困扰，研究表明。
The eroding boundary between work and family life, fueled by constant availability via cellphone ore-mail, takes a greater emotional toll on women, a new study finds.
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