drum folding mechanism 主动折鼓机构
The latter two folds were both derived from the longitudinal folding mechanism.
主期与晚期褶皱均形成于纵弯褶皱机制。
A loading test has been added to check the rigidity of the folding mechanism and locks.
新标准增加了装载测试，以检查折叠装置和锁闭装置的牢固性。
Main Features: Audi branding, folding mechanism, articulated frame steering and the untypical frame setup.
主要特点：奥迪品牌，折叠机制，铰接式车架转向和非典型帧设置。
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