The scientists have not found any explanation for the mysterious phenomenon.

Source: Tatoeba

In its home country, France, Tatoeba became a social and cultural phenomenon.

Source: Tatoeba

An eclipse of the moon is a rare phenomenon.

Source: Tatoeba

It's a phenomenon I've never seen before.

Source: Tatoeba

Is it normal that many young people these days idolize pretty boy stars?

Source: Tatoeba

Acid rain is not a natural phenomenon.

Source: Tatoeba