two-by-four
/ˈtuːbaɪˌfɔː(r)/noun
1- a length of wood with a rectangular cross section nominally two inches by four inches截面为2英寸×4英寸的木材
1.1
- usu. as modifier W. Indian &. US a small or insignificant thing, typically a building〈西印度, 美〉（尤指建筑物）小的; 微不足道的：
they lived in a two-by-four shack of one bedroom.
他们住在一个单卧室小棚屋里。