这些表层堆积物覆盖面积达10平方公里（4平方英里）；
those deposits cover more than10 square kilometers (4 square miles).
为了赢得一些额外的面积，这就涉及到某些元素的堆积。
This involved stacking some elements of the programme in order to win some additional square meters.
球形颗粒荧光粉的光散射面积最小，堆积密度大，有助于提高发光材料的发光强度和使用寿命。
Spherical particles have minimum scattering area, high packing density; which is beneficial to the luminescent intensity and lifetime of the devices.
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