在只使用一种药物时，更可能发生耐药性。
Resistance is more likely to occur when only one drug is used.
他在使用一种危险的药物——这种药物很快作用于中枢神经系统。
He's taking a dangerous drug: it acts very fast on the central nervous system.
一种被发现的如此之早的药物，至今却仍被使用，这非常罕见。
It is certainly rare that such an early pharmaceutical discovery is still in use today.
另外一种是序贯疗法，即不同的治疗药物连续而不是混合使用。
The other is sequential therapy, in which medication regimens are given one after another.
广霍香精油，在东方，传说中被发现作为一种传统的药物使用。
Patchouli essential oil has traditionally found its USES as a traditional medicine in the East.
在临床治疗中，药物的使用仍是处理角膜瘢痕的一种选择。
In clinical treatment, drugs are still a choice to treat corneal scar.
在临床治疗中，药物的使用仍是处理角膜瘢痕的一种选择。
In clinical treatment, drugs are still a choice to treat corneal scar.
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