something that makes people want to leave a place or escape from a particular situation

Instead of a fruitless attempt to eliminate illegal immigration, rich countries could focus on reducing the push factors that force some to flee - chiefly poverty and persecution. 与其徒劳地试图消除非法移民，富国不如把精力放在减少迫使人逃离的推动因素上——主要是贫穷和迫害。