ōu zhōu qiú lián sài : yǐn shí > ā 
mùlù
No. 1
   ā (attometer huò am) shì cháng dān wèi, 1 ā xiāng dāng 10^(-18)
   huàn suàn guān
  0.001 fēi (fm)=1 ā
  0.000001 (pm)=1 ā
  0.000000001 (nm)=1 ā
  0.000000000001 wēi (µm)=1 ā
  1000 ā =1 fēi (fm)
  1000000 ā =1 (pm)
  1000000000 ā =1 (nm)
  1000000000000 ā =1 wēi (µm)
xiàngguāncí
shēn 'ài de hái
bāo hán cí
ā