Now that system builds were starting to take place, we.d soon be stepping up our testing efforts.
现在系统的构建开始进行了，我们很快的将步入测试工作。
2
That successor system is also designed to return humans to the moon by 2020, as a stepping stone to visiting Mars.
继任的系统同样是设计用来2020年重返月球的，同时作为远征火星的踏脚石。
3
In this paper, microcontroller, stepper motor driver chips, character LCD and keypad array, build a set of stepper motor controller and driver as one of the stepping motor control system.