Can be divided into: single hook slide rails, double hook slide rails.
本类型机可分：单吊钩滑轨、双吊钩滑轨。
We need to leave the outer slide rails some play for proper alignment later.
等会儿要进行位置校准，我们得给外滑轨预留一点儿校准空间。
We need to leave the outer slide rails some play for proper alignment later.
等会儿要进行位置校准，我们得给外滑轨预留一点儿校准空间。
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