a secure investment

• 有保证的投资

a secure investment的用法和样例：

例句

1. No backup is a guaranteed compromise.
   没有备份是有保证的妥协。
2. In the course short summer holiday I changed from a schoolboy with a secure future to a man with no future at all.
   在那个短短的暑假中，我从一个前途有保证的中学生一下子变成了一个毫无前途的成年人。