这种新药的效力很强，医生建议从小剂量开始服用。

The new drug has significant ___potency, so doctors recommend starting with a small dose.

压力可能会暂时降低男性性功能。

Stress can temporarily reduce a man's ___potency.

这种药物的效力足以在几分钟内缓解疼痛。

The ___potency of this medicine is strong enough to relieve pain within minutes.