two-by-four

US /ˌtuː baɪ ˈfɔːr/
UK /ˌtuː baɪ ˈfɔːr/
"two-by-four" picture
1.

二乘四木料, 方木

a piece of lumber with a rectangular cross section, nominally 2 inches by 4 inches, used in construction

:
He used a two-by-four to brace the wall.
他用一根二乘四木料來支撐牆壁。
The frame was built with several two-by-fours.
框架是用幾根二乘四木料搭建的。