单词：be sure
一定，务必
be sure的用法和样例：
例句
- When you start the engine, be sure the car is in neutral.你在发动引擎时，一定要让汽车处于空档。
- Can I be sure of a profit if I invest?我要是投资，肯定能获利吗?
- He likes to be sure of his bodily comforts.他注重身体上的舒适。
- Even if you saw him pick up the money, you can't be sure he stole it.就算你看见是他拾起的钱，你也不能肯定钱就是他偷的。
- Arriving on foot, he could be sure of taking his men unawares.步行到达，他确信会使手下的人大吃一惊。
- You can be sure.你可以肯定。
- Be sure you are right, then go ahead.确信正确，切莫畏缩。
- I can't be sure.我不能肯定。