primary feather

常見例句

用作名詞 (n.)

• Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.
  翼上初級飛羽呈現(xiàn)灰白色，翼前緣經(jīng)常為淡棕色或黃棕色，比飛羽的深灰色要淺。
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