光滑流是满足某些条件的映射。微分流形M上任一有紧支集的光滑向量场在M上产生一个光滑流。
爱探险游的客可以选择几条“离步道”路线，由公园管理员带领下通过狭窄的入口，借用绳索和梯子穿过光滑流石到达溶洞。拍摄于2010年12月18日。
Adventurous visitors can opt for several "off-trail" Tours guided by park rangers through narrow passage ways, across slick flow stone and down ropes and ladders.
③相等平均隙宽条件下的粗糙裂隙比光滑裂隙的过流能力小得多。
The fluid passing ability for coarse fractures is smaller than the smooth fractures on the same conditions.
产品外观光滑，无粒点，无流痕。
Product appearance of smooth, non-grain points, no flow marks.
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