They questioned the effectivity of the new teaching methods.

他们质疑新教学方法的有效性。

We need to measure the effectivity of this marketing campaign.

我们需要衡量这次营销活动的有效性。

The effectivity of the medicine was proven through clinical trials.

这种药物的有效性通过临床试验得到了证明。

The effectivity of the new policy will be evaluated next month.

新政策的有效性将在下个月进行评估。

The effectivity of the training program is evident in the results.

培训项目的有效性在结果中显而易见。

Case analysis show the availability and effectivity of this new approach.

通过案例分析证明该方法的有效性。

Objective To evaluate the effectivity and safety of child virus diarrhea treated by cimetidine and dipyridamole.

目的观察甲氰咪胍联合潘生丁治疗小儿病毒性腹泻的有效性与安全性.

Objective:To explore the effectivity and safety of minimally invasive targeting ArgonHelium cryoablation in the treatment of hepatic carcinoma.

目的：探讨经皮细刀头氩氦刀靶向冷冻治疗肝癌的有效性及安全性。

Researches on hydrogel are carrying out actively in chemical methods while various of multipolymers with safty and effectivity have been synthesized.

在化学方法中，对水凝胶的研究开展较为广泛，同时还合成了多种较为安全有效的多聚物。

High intensity focused ultrasound(HIFU)is increasingly becoming a new non-invasive therapy for tumors for its safety and effectivity.

高强度聚焦超声（H IFU）以其安全性、无创性、有效性的特点正日益成为治疗和辅助治疗多种肿瘤的新方法。