光学显微镜和穿透式电子显微镜要求将材料切成更薄的片，或在仔细观察前将其控制在玻璃下。

Light microscopes and transmission electron microscopes require that materials be sliced thinly, or trapped under glass before being examined.

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而即便是最强大的电子显微镜也无法看到的一个细胞的内部结构，染料不能穿透到微小的病毒内。

And even the strongest electron microscope can't see the inside of a cell and dyes can't penetrate microscopic viruses.

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