Detection of insecticide resistance should be an essential component of all national malaria control efforts to ensure that the most effective vector control methods are being used.
杀虫剂耐药性检测应是各国疟疾控制工作的一项重要内容，以确保使用最有效的病媒控制方法。
2
With such broad and regular use of the drug over the years monitoring drug resistance is essential to ensure ongoing worm control success.
由于在过去数年内大范围惯常使用此药，为确保正在进行的蠕虫控制工作取得成功，必需监测耐药发生情况。
3
Selenium is an essential antioxidant mineral that performs many functions in the body including preservation of normal liver function and maintaining resistance to disease.