开口运动：将经纱分成两层，以形成梭口。
Shedding: separating the warp threads into two layers to form a shed.
最简单的平纹织物织机，开口运动只使用两页综框。
Consider the simplest, plain shuttle loom on which only two harness frames are used FOR the shedding operation.
同时对关节盘的位置、开口运动中的移位和旋转进行定量测量。
The disk position, translation and rotation during jaw opening movement were also measured.
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