slack adjuster frame 间隙调整框
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The chair back is connected with the seat frame through an angle adjuster that makes the angle between the chair back and the seat frame adjustable, and makes the fishermen sit comfortably.
椅背 和座框由角度调节器连接，调节角度调节器使椅背和座框间的角度可调， 坐得更舒服；
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