be sure 确信,肯定 I can't be sure. 我不能肯定。 make sure查明; 设法确保, 确定 You must make sure of the time and place. 你必须把时间和地点弄清楚。 Make sure at least two people from the marketing team can attend. 要确定销售部门至少要有两个人来参加。
