I suppose the environmental way would be to use tongue-in-groove lumber.
我感觉有榫舌和凹槽的木材才是环保的。
2
This forces water through a tube formed by the tongue pressed against a groovein the roof of the mouth.
这迫使水流过一条由舌头压在上颚的沟槽部分形成的管道中。
3
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.