上课专心勤思考用英语怎么说

"Pay attention, be diligent and think critically" 的英文表达是 "pay attention, be diligent, and think critically"。这个短语的意思是在课堂上要集中精力，勤奋学习，并进行批判性思考。

例句1:
"It's important to pay attention, be diligent, and think critically during class in order to truly understand the material." (在课堂上集中精力，勤奋学习，并进行批判性思考是理解材料的关键。)

例句2:
"If you want to excel in your studies, you must pay attention, be diligent, and think critically in every class." (如果你想在学习上有所成就，你必须在每堂课上集中精力，勤奋学习，并进行批判性思考。)