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の一員だ

be a member of

→ の
phrase Uncommon #15,706
be a member of Used to say that someone belongs to or is part of a group, organization, team, or family. The ending may change according to politeness or grammar, such as の一員です or の一員である.
JA: 私はこのチームの一員だ。
EN: I’m a member of this team.

彼は野球部の一員だ。

He is a member of the baseball team.

この犬は言わばうちの家族の一員だ。

This dog is, so to speak, a member of our family.

彼女はバスケットボール部の一員だ。

She is a member of the basketball team.

調理場の一員だよ

I'm part of the kitchen staff.

— レミーのおいしいレストラン (2007)