loss and gain英lɒs ænd ɡeɪn美lɔːs ənd ɡeɪn短语¹⁰⁶¹⁰⁰⁺⁵ 基本例句 经损益; 盈亏 I use questionnaire in teaching practice, and rethink the loss and gain of this research. I display some teaching cases so as to provide theoretical guidance for future researchers. 在问卷调查基础上展开实际教学，进行教学小结，反思本研究的得失，并展示部分教学案例，为今后物理实验教学提供理论指导。591-lw