STEM与日常科技·英语30篇（1）
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Why Semiconductor Cleanrooms Matter
半导体洁净室为什么重要
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Modern microchips contain transistors smaller than 5 nanometers — about 1/10,000 the width of a human hair.现代微芯片中的晶体管尺寸小于5纳米，约为人类头发直径的万分之一。
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A single speck of dust larger than a transistor could break an entire circuit pattern during photolithography.光刻过程中，一颗比晶体管还大的灰尘微粒就可能破坏整个电路图案。
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Cleanrooms use advanced air filtration, positive pressure, and strict gowning protocols to limit particles to fewer than 10 per cubic meter.洁净室采用先进的空气过滤系统、正压环境和严格的着装规范，将每立方米空气中的颗粒物控制在10个以内。
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Workers wear full-body suits, gloves, masks, and shoe covers to prevent skin flakes, hair, or fibers from contaminating wafers.工作人员须穿戴全身防护服、手套、口罩和鞋套，以防皮屑、头发或纤维污染晶圆。
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Even airflow is carefully engineered: laminar flow pushes particles downward and away from sensitive silicon surfaces.气流也经过精密设计：层流将颗粒物向下并远离敏感的硅片表面推离。
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Vibrations, temperature swings, and static electricity are also tightly controlled, since they can distort nanoscale etching.振动、温度波动和静电同样受到严格管控，因为它们会干扰纳米级刻蚀精度。
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Without such environments, mass production of smartphones, medical scanners, or electric vehicle controllers would be impossible.若无此类环境，智能手机、医疗扫描仪或电动汽车控制器的大规模生产将无法实现。
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Each chip wafer passes through hundreds of steps across multiple cleanrooms — any contamination risks scrapping thousands of chips.每片芯片晶圆需在多个洁净室中经历数百道工序，任何污染都可能导致数千颗芯片报废。