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没有靠山，舌形的护罩，侧面的护罩。
No tool rest, tongue guard or side guard.
youdao
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榫舌可呈S形以与凹槽形成互锁关系。
The tongue can be S-shaped to form an interlocking relationship with the groove.
youdao
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榫舌可呈S形以与凹槽形成互锁关系。
The tongue can be S-shaped to form an interlocking relationship with the groove.
youdao