居然 (jū rán) means “unexpectedly; to one's surprise; go so far as to”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
没想到他居然能够克服这么大的困难成功了。
Méi xiǎngdào tā jūrán nénggòu kèfú zhème dà de kùnnan chénggōng le.
Unexpectedly, he was actually able to overcome such great difficulties successfully.
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