The radius of a circle is 4cm, how many square centimeters is its area?
一个圆的半径是4厘米，它的面积是多少平方厘米？
"The structures we've made are square centimeters in size," he explains.
“我们已经制造的结构只是平方厘米(square centimeter)级的，”他解释说。
In about 50 square centimeters of area and distribution has 1700 of these units.
在大约50平方厘米的面积上便分布有1，700个这样的单元。
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