通过反复的练习 Through repeated exercise ; Through repeated practice
通过反复试验 through trial and error
通过反复试验学习 Learn by trial and error
通过反复实验研究 Through Repeated Experimental Investigation
通过反复地提出问题 inquiry based dialogue
反复通过
Pass repeatedly
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本试验用强迫猪链球菌反复通过不易感的鸡体继代的生物学方法，选育出一株弱毒猪链球菌。
The C_(135) strain attenuated from a prototype of streptococcus suis through repeated insusceptible chicken passage pathway is successful and here presented.
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