这项研究的真正意义在于，又再一次表明了睡眠有助于大脑细胞功能的修复以及起到保护的作用。

The significance is that, yet again, it shows sleep may contribute to the restoration of brain cell function and may have protective effects.

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这堵墙挡着常刮的风，起到一些保护作用。

The wall gives some protection from the prevailing wind.

《牛津词典》

有些人怀疑这些与国防有关的研究项目能否提高我们的生活水平，或者对保护我们日益减少的资源能否起到很大的作用。

There are those who consider it questionable that these defense-linked research projects will either improve our standard of living or do much to protect our diminishing resources.

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