The researchers used a form of microscopy called cryo-EM, where they freeze the virus, then shoot high energy electrons at it.

研究人员使用了一种称为冷冻电子显微镜的显微镜，他们在那里冷冻病毒， 然后向它发射高能电子。

The real situation is fiendishly complex and involves pretty hairy quantum mechanics, but in the end, the electron is only allowed to occupy very specific volumes of space around the nucleus, and those depend on the electron's energy.

实际情况极其复杂，涉及到相当复杂的量子力学，但最终，电子只能占据原子核周围非常特定的空间，且这些空间取决于电子的能量。