重點講解：
1. in preparation for 準備；預備；籌備；
This includes testing the product in preparation for release and making minor adjustments based on user feedback.
這包括在系統發布的準備中測試產品，并且基于用戶的反饋對系統進行小的調整。
2. put into operation （使）施行；（使）實行；（使）生效；
The production line newly put into operation this time was self-designed, self-developed, and self-debugged by the company.
這次新投產的生產線，由該公司自行設計，自行開發，自行調試。
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.
該系統投入運行后，大大提高了設備的安全運行率。
4. take part in 參加；參與；
One either can take part in this contest through self-recommendation or can be nominated by others.
參加本次競賽既可自薦，也可他薦。