版画家用的尼龙网以每平方厘米29目的为宜。
在你们家里的下水道有超过每平方厘米的77.500细菌。
Over 77,500 bacteria per square centimeter can live in your sink drain.
相对的,通过镜子汇聚太阳光,能够在光伏芯片上产生每平方厘米20w。
By contrast, photovoltaic cells absorbing sunlight can produce about 20 watts per square centimetre, provided the light is carefully concentrated using mirrors.
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