+7 = 10 

āi

  1. 塵土灰塵 」。

  2. 量詞物理學計算長度電磁波波長等於公分angstrom)​

dust, dirt, Angstrom or Ångström, unit of length equal to 10^-10 meters, phonetic ai or e, abbr. for Egypt 埃及[Ai1 ji2]
poussière, saleté, Angstrom, (abrév.)​ Égypte
Ångström, Å (S, Phys)​