他清除了鞋中的一粒石子。

He removed a stone from his shoe.

《柯林斯英汉双解大词典》

然而，在粒间孔发育的岩石中，流体必须在颗粒周围的曲折通道中流动；而这种曲折通道会对其流动产生阻力。

In the intergranular spaces of rocks, however, fluid must flow around and between grains in a tortuous path; this winding path causes a resistance to flow.

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上升过程中，这些元素附着在空气中的尘埃上，变成微粒，大小相当于一粒砂子的四分之一。

As these rise, they latch on to dust in the air and become particulates, a quarter the size of a grain of sand.

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Again, these plasmids occur naturally in nature; they were discovered particularly in micro-organisms have plasmids that confer biological properties onto them.

此外,质粒存在于自然界中,质粒是在微生物中发现的,它们也赋予了微生物一些生物学特性

耶鲁公开课 - 生物医学工程探索课程节选

Well, I talked about the problem of using plasmids in gene therapy, that it's very difficult to get them into cells.

我们之前讨论过,基因治疗中运用质粒的问题,质粒本身极难进入细胞

耶鲁公开课 - 生物医学工程探索课程节选

I apply ligase, and I've got the plasmid that I had before but now with my gene, colored green here,inserted.

我用连接酶,就能在质粒中把基因,这里绿色的部分,插进去

耶鲁公开课 - 生物医学工程探索课程节选