• If all velocities reversed direction, ...
• When reaching the free surface, the bubbles reversed their direction ( of motion ) ( or reversed the direction of their motion ).
• If all velocities reversed direction, ...
• When reaching the free surface, the bubbles reversed their direction ( of motion ) ( or reversed the direction of their motion ).
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012