这种滤清器只允许空气以小阻力流入发动机。

This filter permits air to flow into the engine with little resistance.

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然而，目前还没有关于人类小阻力动脉内皮功能障碍预测作用的资料。

However, no data are presently available about the prognostic role of endothelial dysfunction in human small resistance arteries.

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例如，在罗马时代，工程师们发现如果桥的上游的桥墩建成对目前河流水阻力小的形状，桥墩的寿命会更长。

For example, in Roman times, engineers discovered that if the upstream supports of a bridge were shaped to offer little resistance to the current of a stream or river, they would last longer.

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