もし湿気の多い環境に長く居続けたら、夏が来る前に私はカビが生えるだろう。

If I stay in the excessive humidity for too long, I will become moldy before summer arrives.

もし古い城の壁が定期的に手入れされなければ、すぐにカビてしまうだろう。

If the walls of the old castle were not regularly maintained, they would quickly become moldy.

もし湿気が続けば、この古い壁はゆっくりとカビるだろう。

If the humidity persisted, this old wall would mold slowly.

古い城の湿った空気の中で、私はゆっくりとカビが生えるだろう、時間と忘却の犠牲として。

In the humid air of the old castle, I would mold slowly, a victim of time and oblivion.