it is questionable that的用法和樣例：
例句
用作副詞 (adv.)
- These programs had unanticipated and often questionable political side effects.
這些計劃在政治上產生了一些預料不到的，往往成問題的副作用。 - But, in contrast, it is only in modern times that Galileo has become a problem child for historians of science.
但是相比之下，對於科學史家來說，伽利略只是在現代才變成了一個成問題的孩子了。
