夏洛克·福尔摩斯通过巧妙的推断破解了此案。

Sherlock Holmes solved the case through clever ___deduction.

根据现有的线索，我得出的推断是她已经离开了这个国家。

My ___deduction, based on the available clues, was that she had already left the country.

要得出正确的结论，既需要观察也需要逻辑推理。

Arriving at the correct conclusion required both observation and logical ___deduction.