"Ineffective"是一个常用的形容词，用来形容某物没有产生预期的效果或作用。这个词的来源可以追溯到拉丁语"ineffectivus"，意思是"无效的"或"无用的"。
例句:
The medication was ineffective in repeving her pain. (这种药对缓解她的疼痛没有效果。)
The company's marketing strategy was ineffective and they ended up losing customers. (公司的营销策略没有成效，最终导致了客户流失。)
The teacher tried several different methods, but they were all ineffective in getting the students to pay attention. (老师尝试了几种不同的方法，但都没能让学生集中注意力。)
例句:
The medication was ineffective in repeving her pain. (这种药对缓解她的疼痛没有效果。)
The company's marketing strategy was ineffective and they ended up losing customers. (公司的营销策略没有成效，最终导致了客户流失。)
The teacher tried several different methods, but they were all ineffective in getting the students to pay attention. (老师尝试了几种不同的方法，但都没能让学生集中注意力。)