が含まれています

contains

→ が
phrase Rare #41,610
contains Used to say that something includes or contains a particular ingredient, substance, or element. The phrase is polite and commonly used in descriptions of food, products, and texts.
JA: この飲み物にはカフェインが含まれています。
EN: This drink contains caffeine.

このケーキには小麦粉牛乳砂糖が含まれています

This cake contains flour, milk, eggs, and sugar.

海水にはが含まれています

Seawater contains salt.