Whereas modern apes exhibit a rich repertoire of locomotory modes— from the highly acrobatic brachiation employed by the arboreal gibbon to the gorilla's terrestrial knuckle walking— early Miocene apes were obliged to travel a 虽然现代猿的移动模式花样繁多,例如长臂猿在树间以双臂移动身体、猩猩在地面上以上肢手背关节支撑体重,但是中新世早期的猿类都以四肢在树枝上活动。
brachiation
[ noun ] swinging by the arms from branch to branch <noun.act>