If requested, the first and last plank can have visible veneered edges, without tongue or groove, finished to match the face of the plank.

如果提出要求，第一个和最后一个木板可以看得见单板边缘，但无舌或槽，成品，以配合面临的木板。

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For this purpose, the filling groove (34) is preferably structured to cause the sealed ring (33) to keep existed and visible.

为此，填充槽(34)优选构造成使得尽管存在密封环(33)也保持可见。

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