我感觉有榫舌和凹槽的木材才是环保的。

I suppose the environmental way would be to use tongue-in-groove lumber.

youdao

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

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