Researchers have found that it is a good idea to break up your normal training routine with a different sport as it avoids repetitive strain injuries and increases the strength of joints and muscles.

研究人员发现，进行不同的体育活动，打破以往的训练程序是个很好的主意，因为这样能避免重复性肌肉拉伤，增强关节和肌肉的强度。

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Upon heating the zeolite, the normal siloxane linkage would also experience strain due to thermal expansion.

当加热沸石时，由于热膨胀作用，正常的硅氧烷键也会存在张力。

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The new siloxane linkage can experience strain if the two silicon atoms are not sufficiently close enough for the formation of a normal siloxane linkage.

如果这两个硅原子之间的距离大于形成正常硅氧烷键所需的距离，新形成的硅氧烷键就会存在张力。

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"We are cautiously optimistic that this particular strain will not be more severe than a normal seasonal flu outbreak, " Napolitano said.

CNN: The story

Ryuzo Yanagimachi, a biologist at the University of Hawaii, found that when he cloned a certain strain of mice prone to have diabetes, the clones would look normal at birth, but upon reaching puberty -- which, in mice, is after eight weeks -- they gained weight.

CNN: Cloning experts to tell House committee pros, cons