Yap.Town

の種

cause of; source of

→ の
phrase Uncommon #18,134
cause of; source of Follows a noun to describe something that causes worry, trouble, or another problem.
JA: それが彼の苦労の種だった。
EN: That was the source of his troubles.

お前はいつも私の心配の種だよ。

You're always a source of worry for me.

熱帯雨林が心配の種である。

The rainforest is a cause for concern.