"Let me go with Du Guangbai to complete this experiment?"

"Teacher, I did a good job of experimenting alone. This time I want to do it alone as well......"

"Besides, your new student is excellent, and he doesn't need my help."

"I ...... To be honest, I didn't want to work with him. ”

"Teacher, you don't need to apologize, I also supported your research, teacher, to help, it's just ...... It's just that...

"Do you hear it" experiment (4) is in the middle of the hand, please wait a moment,

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