How could so many tiny fragments of DNA be pieced together?
怎么可能将如此多的DNA小片段整合起来呢？
The grains here are tiny fragments of a baby sea urchin shell.
例如这些颗粒就是海胆幼体外壳上的碎片。
Last year, two satellites even collided, showering their orbit with tiny fragments that now pose additional risk to operational spacecraft.
去年甚至还发生了两颗卫星相撞的事件，碰撞所产生的碎片散布在整个轨道上，更增加了其他航天器的运行风险。
Last year, two satellites even collided, showering their orbit with tiny fragments that now pose additional risk to operational spacecraft.
去年甚至还发生了两颗卫星相撞的事件，碰撞所产生的碎片散布在整个轨道上，更增加了其他航天器的运行风险。
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