The microscope works by scanning a focused beam of electrons across an object.
扫描电子显微镜是通过扫描聚焦在物体上的电子束来工作的。
2
A single pair of beams does not, however, produce a useful image. To do that requires scanning the objectbeam through the target about a hundred different ways.
不过仅利用一对光束并不能得到有用的图像，还需要从大约100个不同的角度让物体光束扫描目标。
3
Thee microscope works by scanning a focused beam of electrons across an object.