And when scientists looked at the strain infecting the chimps, they found that it was a close relative of the virus that first infected humans.

当科学家们研究感染黑猩猩的病毒菌株时，他们发现这是与首先感染人类的病毒所密切相关的一种病毒。

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A 35 lb (156 N) force was applied for a period of 1 min to the supply cord at the strain relief in a direction to cause the greatest movement of the cord.

用35英镑（156牛顿）的同方向拉力作用于出气冒口的电源线，维持一分钟，从而使电源线的移动行程最大。

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The analyses showed that RAPD is able to differentiate mainly at the species level, while ERIC is effective at the strain level and therefore more consistent with cultivation characteristics.

分析表明，RAPD方法主要在种的水平上进行鉴别，而ERIC则可以在菌株水平上进行鉴别，结果与菌株栽培性状更为一致。

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(Speaking) But a study at the University of California Berkeley found that 3-D movies can cause eye strain.

VOA: standard.2010.02.21

So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.

现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。

麻省理工公开课 - 化学原理课程节选

The official number is secret, but news reports say the general wants about The request is controversial, not least because with the U.S.troop level in Iraq expected to remain around its current 120,000 for at least several more months, the strain on the U.S.Army is considerable.

VOA: standard.2009.10.13

He said he was shocked by the figures and concerned at the strain it would put on island services.

BBC: Cap on Jersey population possible says minister

This latest coalition re-launch will offer no shortage of those for tired hacks trying to assess the strength of the ties and the extent of the strain at the top of the government.

BBC: Coalition: derailed or back on track?

Among the options the ECB may consider this week are purchasing Italian and Spanish sovereign debt, aimed at easing the financial strain on those countries.

FORBES: Market Turns Defensive As Investors Wait On Bernanke, Draghi