奇速英语

Preston Bell is seven years old. One day, he took the bus to school with his classmates. When the bus arrived at a Dallas elementary school, Bell went to the bus driver, Raquel Radford Baker. He looked ill and needed help.

Baker found that Bell was choking (噎住). She began performing the Heimlich maneuver (海姆利克氏急救法). At last, Bell got healthy.