重点讲解：
1. in preparation for 准备；预备；筹备；
This includes testing the product in preparation for release and making minor adjustments based on user feedback.
这包括在系统发布的准备中测试产品，并且基于用户的反馈对系统进行小的调整。
2. put into operation （使）施行；（使）实行；（使）生效；
The production line newly put into operation this time was self-designed, self-developed, and self-debugged by the company.
这次新投产的生产线，由该公司自行设计，自行开发，自行调试。
3. put into use 投入使用；
Since the system was put into use, the ratio of the equipment has greatly increased in safe operation.
该系统投入运行后，大大提高了设备的安全运行率。
4. take part in 参加；参与；
One either can take part in this contest through self-recommendation or can be nominated by others.
参加本次竞赛既可自荐，也可他荐。