例句與造句

1. Due to the nature of image formation in the electron microscope, bright-field TEM images are obtained using significant underfocus.
2. z = the defocus of the objective lens ( using the convention that underfocus is positive and overfocus is negative ), \ lambda = the relativistic wavelength of the electron wave, C _ s = The spherical aberration of the objective lens, k = the spatial frequency ( units of m  " 1)
3. It's difficult to find underfocus in a sentence. 用underfocus造句挺難的