(1) move backward ::
txav rov qab(2) backward compatibility ::
rov qab compatibility(3) forward and backward ::
pem hauv ntej thiab rov qab(4) walk backward ::
taug kev rov qab(5) backward integration ::
rov qab koom ua ke(6) go backward ::
mus rov qab(7) backward-looking ::
rov qab-nrhiav(8) backward and forward ::
rov qab thiab xa(9) backward glance ::
rov qab nuam(10) backward motion ::
rov qab tsab ntawv tsa suab