be sure of

汉语翻译

例句：

1. Can I be sure of a profit if I invest?
   我要是投资，肯定能获利吗?
2. Book early if you want to be sure of a seat.
   要想十拿九稳有个座位，那就早订座。
3. I left a message so as to be sure of contacting her.
   我留下了张条子以便与她取得联系。
4. He likes to be sure of his bodily comforts.
   他注重身体上的舒适。