例句與造句

1. First , we simply introduced the optical wave - guide theory : the fluctuation equations of planar wave - guide and the preparation of embranchment wave - guide . then based on maxwell equations and in the paraxial limit we deduced the formula needed in calculating fd - bpm . the refractive index section was n ( x , y )
   然后我們?cè)趍axwell方程的基礎(chǔ)上，根據(jù)慢包絡(luò)近似理論，在折射率截面為n ( x ， z )的條件下，利用有限差分近似來(lái)代替偏微分方程，推出了有限差分光束傳播法計(jì)算所需要的公式。
2. It's difficult to find indexing section in a sentence. 用indexing section造句挺難的