New species are merely mutants of earlier ones.

新物种不过是早先物种的突变体。

《柯林斯英汉双解大词典》

But a new study finds that just a few resistant mutants can protect large Numbers of normal bacteria that would have been thought to be susceptible to the drug therapy.

但是一项新的研究发现，仅有几种基因突变可以保护大部分普通的细菌，使其对药物治疗免疫。

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The new results were obtained as follows: All the mutants could be grown photoautotrophically. However, their growth speed was very slow either on HS or TAP medium as compared with the control;

对突变体的分析，有以下新结果：突变体都能进行光合自养，但无论在异养培养基上还是自养培养基上，和对照相比，其生长速度非常缓慢；

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