Occasionally, a bubble is not removed during refining, a sand grain refuses to melt, a tremor in the tin puts ripples into the glass ribbon.

"有时候，在提炼的过程中会出现这些情况：一个气泡没有被移除，一个砂粒没有熔化，（熔融的）锡的一次颤动把波纹带进了玻璃带中。

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A new expression of cubic sand grain concentration is put forward, and it is used as the boundary conditions in the calculation.

本文提出一个新的沙粒起动体积浓度的表达式，并在计算中作为边界条件。

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The paper describes influence, importance and requirements of sand grain composition and its control methods in the sand-lime brick production.

本文综合论述灰砂砖生产中砂子颗粒级配的影响、要求和重要作用以及应当进行控制的工艺环节和措施。

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There is something that one might be able to hold on to: the knob of something, the little flame of something that ; The grain of sand. -The grain of sand; but there is really not a decent metaphor for it, I think.

一个你可以依靠的支点：,一个不同寻常的想法，一个思想的小火花,就像一粒沙中看世界，-一粒沙中看世界;,不过我认为任何比喻都不够贴切。

普林斯顿公开课 - 人性课程节选

She discovered that she could scoop handfuls of mixed sand and grain and then toss the mix out onto the water.

FORBES: The Rising Silver Tide: Aging as Counter Current to Innovation

Finding the antigens is like searching a beach for a particular grain of sand.

FORBES: In search of antigens

Most are smaller than a grain of sand, according to the American Meteor Society, and usually burn up before they hit Earth's surface.

WSJ: Meteor Creates a Show, No Apparent Damage