They wish to promote a real and effectual understanding between the two countries.他们希望真正有效地促进两国间的理解。This is the only effectual way to secure our present and future happiness.这是确保我们现在及以后都会幸福的唯一有效途径。Quinine is an effectual remedy for malaria.奎宁是治疗疟疾的有效药品。The government should take effectual measures to combat unemployment.政府应采取有效措施来对付失业问题。