细流是小溪，小水流。一般是在山间，潺潺溪水，细水长流。 在雨季的话，溪水会比较浑浊。
一点儿细流的水也没有。
他常常用衣袖蒙住脸，但却挡不住细流的汗水。
Ofttimes he drew his sleeve across his face, but there was no damming that trickle.
所以即使在正常条件下，这些亚物种间的基因流动也更像是一条断断续续的细流，而不是一条不停流淌的小溪。
So, even under normal situations, the gene flow among the subpopulations is more of an intermittent trickle than a steady stream.
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