jammed in, shellfish, mediate, concern oneself with

私が手にしてるのは貝の化石です。

What I have in my hand is a fossil seashell.

貝は好きではない。

I don't like shellfish.

砂浜でいろんな貝を拾うのは実に楽しい。

It is a lot of fun picking various shells on the sands.

火力とお鍋と貝の種類によるわ。

It depends on the strength of the flame, the pan used and the type of ingredients.