, holds a bundle of spears that he made for use with an atlatl, a Stone Age throwing device that uses leverage to sharply increase the speed and distance a spear can travel.

这是他制作的和梭标投射器（利用杠杆作用加快长矛速度、增加投射距离的石器时代的一种投射装置）一起使用的长矛。

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Overall, an increase in the brain's production of endorphines occurs when the body is put under stress such as long distance running, and the endorphines then cause a positive or negative mood change.

总之，身体在紧张感下，比如长距离的奔跑，会增加内啡肽的分泌量。而内啡肽会令人产生情绪的变化，有正面也有负面的情况。

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The White House is offering an 83%-17% split (hardly a huge distance) and a promise that none of the revenue increase will come from higher marginal rates, only from eliminating loopholes.

白宫提出将支出削减率和税收提高率分别控制在83%和17%（和共和党提出的比率实在是没有多大差别），并且承诺只会通过消除漏洞而非提高边际税率来增加财政收入。

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Because the output of a wind turbine also tends to increase proportionally with its distance from barriers such as trees or buildings, the most productive -- and cost-effective -- turbines sit atop tall towers erected on an acre or more of open land.

CNN: Stimulus may get small wind turbines spinning

Another petition calls for a change in planning regulations to enable an increase in the current "neighbour notification" distance of 20 metres.

BBC: Wind farm campaigners present petition to Alex Salmond