警察找到了一条重要的线索，案件很快就破了。

Jǐngchá zhǎo dào le yī tiáo zhòngyào de xiànsuǒ, ànjiàn hěn kuài jiù pò le.

The police found an important clue, and the case was solved quickly.

这个线索太模糊了，我们还需要继续调查。

Zhège xiànsuǒ tài móhu le, wǒmen hái xūyào jìxù diàochá.

This clue is too vague; we still need to continue investigating.

她在日记里发现了一条关键线索。

Tā zài rìjì lǐ fāxiàn le yī tiáo guānjiàn xiànsuǒ.

She discovered a key clue in the diary.