sudden例句：
The populace at large is/ are opposed to sudden change.
民众普遍反对突然的改变。
Educational practice is liable to sudden swings and changes
教学实践中经常会出现突然的变化与改革。
What is the motivation behind this sudden change?
这种突然转变背后的.动机是什么？
The sudden noise made her start.
突如其来的声音吓了她一跳。
His heart gave a sudden leap when he saw her.
他看见她时，心猛地一跳。