大犬座
He determined the amount of neutral gas lying in front of Beta Canis Majoris and in front of 10 other stars in a similar direction.
Canis Majoris───大犬座
Canis Major───大犬座（星座）
Canis Minoris───小犬（星）座
labia majoras───少校
vis majors───vis专业
labia majora───大阴唇
vis major───[保险]不可抗力