The sides of the energy chain are connected through a tongue-and-groove connection.
双方的能源链的连接通过舌槽连接。
2
A closer inspection of the tool mark shows a series of parallel teeth marks, probably from the use of a plumber's wrench or tongue-and-groove pliers.
放大后的检验，可见一系列平行的齿纹，有可能来自管钳，会其他靠钳齿来抓牢工件并旋转的钳子。
3
At present, the tongue-and-groove wood floor was an overwhelming majority in the market of wood floor, and a lot of woods was wasted during its processing.