I finally found the right key after lots of trial and error.

经过反复试验，我终于找到了正确的方法。

youdao

Finally he found one, but so small that it could scarcely be seen. He tried the key, and fortunately it fitted.

最后他终于找到了，这个钥匙孔太小了以至于很难发现。他试了试钥匙，很幸运是合适的。

youdao

Huazhong Agricultural University Proteomics Research Center, led by ho Zhengguo Group of him, and finally found the TB bacteria to help their infection, a key gene in human potential.

华中农业大学蛋白质组学研究中心的何正国带领他的研究小组，终于找到了结核病菌中帮助其感染、潜伏人体的关键基因。

youdao