tiān wén > guó shì chì dào zhuāng zhì
  german equatorial mount
   guó shì chì dào zhuāng zhì
   jiāng chì wěi zhóu zhì zhóu shàng de wàng yuǎn jìng zhuāng zhì fāng shìwàng yuǎn jìng wèi zhóu de duānlìng duān zhì zhòng píng héng