longitudinal beam, longitudinal girder, main beam, main girder, reach
rầm dọc
balk, boom, girder of tunnel timbering, longitudinal bearer, longitudinal girder
xà dọc
baulk, boom, girder of tunnel timbering, longitudinal, longitudinal beam, longitudinal bearer, longitudinal girder, main beam, side member, spar
dầm dọc (cầu)