al pasar por

when going past

when passing through

al pasar por(ahl pah-sahr pohr)

phrase

1. (when passing in front of)

a. when going past

La moto aceleró al pasar por la parada de autobús.

The motorbike revved up when going past the bus stop.

b. when passing by

Al pasar por el ayuntamiento, vi salir a la alcaldesa.

I saw the mayor go out when passing by the town hall.

2. (when crossing)

a. when passing through

Al pasar por el tubo, el fluido entra en contacto con la resistencia y se calienta.

When passing through the tube, the fluid comes into contact with the resistor and heats up.

b. when going through

Vimos una manifestación al pasar por el centro.

We saw a demonstration when going through downtown.

c. when flowing through (river)

Ell río se ensancha y se hace navegable al pasar por esta ciudad.

The river widens and becomes navigable when flowing through this town.