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Ta and ta-ta - English Language Usage Stack Exchange tata also ta-ta, "good-bye," 1823, a word first recorded as infant's speech Abbreviation T T F N , "ta-ta for now," popularized 1941 by BBC radio program "ITMA," where it was the characteristic parting of the cockney cleaning woman character Mrs Mopp, voiced by Dorothy Summers ta 1772, "natural infantile sound of gratitude" [Weekley] At least that's what Etymology Online states
研究生助教TA和RA是什么? - 知乎 TA teaching assistant 是助教,主要辅助授课老师进行教学任务,包括改作业和卷子,带实验课或者辅导课,协助进行课程材料准备,部分学系的TA需要给学生讲课 RA research assistant 是研究助理,主要是按照教授的要求完成研究任务,例如实验设计,实验执行,数据采集数据分析,报告撰写等等