原级：canon
1. Police used tear gas and water canons to try to disperse the hooligans and the battles continued for around 30 minutes.
2. Some soldiers were astride horses that flinched when canons were fired, sending bluish white smoke over the cemetery.
3. Firefighters used water canons to clean the mess off the man before sending him to a hospital.
4. canons
4. Firefighters said they had to use water canons as the nest was situated at a height of 20 meters.
5. Liu criticized Japan for violating the international law by firing water canons at a boat carrying Chinese nationals protesting against Japanese occupation of Diaoyu Islands.