copper starting sheet

例句：

1. 1.This copper starting sheet is perfect for beginners.
   这种铜启动板非常适合初学者。
2. 2. The engineer used the copper starting sheet to troubleshoot the problem.
   工程师使用铜启动板来解决问题。
3. 3. The copper starting sheet helped me understand the circuit better.
   铜启动板帮助我更好地理解电路。