erect posture造句

• An extremely stiff , erect posture
  过分笔直，僵立的姿态
• These apes when moving on level ground began to drop the habit of using their hands and to adopt a more and more erect posture in walking
  大概首先是由于它们的生活方式的影响，使手在攀援时从事与脚不同的活动，因而在平地上行走时就开始摆脱用手帮助的习惯，渐渐直立行走。