programmed mixture-ratio control

例句：

1. 1. The program was designed to teach children basic math skills.
   这个程序旨在教授孩子们基本的数学技能。
2. 2. The software is programmed to automatically update the system.
   该软件被编程为自动更新系统。
3. 3. The engineers programmed the robot to follow a specific path.
   工程师们编程让机器人沿着特定的路径移动。