Translation of "Coincidence" in Chinese

It must be a coincidence.

這一定是個巧合。

It could be just a coincidence.

可能只是巧合。

Tom doesn't think this is a coincidence.

汤姆不认为这是一个巧合。

- Completely coincidentally, these two are still being repaired.
- By coincidence, these two are still being serviced.

真的湊巧，這兩樣現在還在維修。