In the twentieth century, electron microscopes have provided direct views of viruses and minuscule surface structures.

20世纪电子显微镜提供了对病毒和极微物体的表面结构的直接观察.

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The crystal shapes and surface structures of synthetic diamonds have been investigated with SEM.

本文采用SEM技术研究了人造金刚石的晶体形态及表面结构.

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