此外，每个实验室数量和排泄率各不相同，一个可能的原因是在使用中各种分析方法不同。
Moreover, the amounts and rates of excretion varied from laboratory to laboratory, one probable reason being the variety of analytic methods in use.
只是最近随着我们在越来越多的国家开展耐药性定期调查，并且随着实验室能力的提高，这些病例以更多数量获得报告。
It is only recently as we carry out regular surveys of drug resistance in more and more countries, and with improvements in laboratory capacity, that these cases are being reported in greater Numbers.
在过去，科学家在实验室培养数量巨大的病毒群以便观察。
Sometimes scientists can detect viruses by rearing vast numbers of them in laboratories.
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