high joint meaning in English

梯级状抬高
凸缝

However the welding property of al mmcs is poor , it ' s difficult to obtain high joint strength . the application of al mmcs has been restricted by the low joint strength
但是铝基复合材料的焊接性能差，很难形成高强度的接头，成为该种材料走向实用化的严重障碍。
It not only provides the basal life security to the astronauts , but also has high joint mobility index , so the astronauts can fulfill all kinds of extravehicular activities with it
舱外航天服除了为宇航员提供基本的生命保障外,还应具有高的活动性能,从而使宇航员能够有效地完成各种舱外作业。