1. The manager's attempts to improve productivity were ineffectual, as the employees continued to underperform.
经理试图提高生产力的努力是无效的，因为员工继续表现不佳。

2. The politician's ineffectual leadership has led to a decline in public trust.
政治家无效的领导导致公众信任度下降。

3. Despite his best efforts, the teacher's attempts to control the unruly class were ineffectual.
尽管他尽力了，老师试图控制不守规矩的班级是无效的。

4. The company's ineffectual marketing strategy failed to attract new customers.
公司无效的营销策略未能吸引新客户。

5. The doctor's ineffectual treatment only made the patient's condition worse.
医生无效的治疗只会使患者的病情恶化。

6. The coach's ineffectual tactics resulted in a crushing defeat for the team.
教练无效的策略导致了球队的惨败。