副项 meaning in English

secondary event

Only by constant improving and perfecting this method can we carry it out successfully
只有不断改进和完善，才能使“主副项制”体育选项课顺利地进行。
In the three - year - practice of " primary - and - secondary - item - choice teaching method " , it is found that this method has its superiorities , and faults as well
摘要高校“主副项制”体育选项课教学经过3年实践，证明它具有较多的优势，但也存在一些不足。