1/ensure释义：
vt. 保证，确保使安全
2/例句：
Please ensure that you have paid the rent before the end of the month.
请确保你在月底前已付清租金。
The purpose of drawing lots is to ensure equal opportunities for every contestant.
抽签是为了确保每一位参赛者获得平等的机会。
3/ensure的形容词形式有：
ensure public security保安
ensure fromv. 保护
