牛乳は酸っぱくなりやすい。

牛乳は酸っぱくなりやすい。

Milk easily turns sour.

牛乳(ぎゅうにゅう)は酸(す)っぱくなりやすい。

Gyūnyū wa suppaku nari yasui.

牛乳 (ぎゅうにゅう)

(cow's) milk

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

酸っぱい (すっぱい)

sour; acid

なる (なる)

that is in; who is called; that is called; that is

易い (やすい)

easy; likely to ..., have a tendency to ...; easy to ...

Readings: ギュウ、うし

Meaning: cow

Readings: ニュウ、ちち、ち

Meanings: milk, breasts

Readings: サン、す.い

Meanings: acid, bitterness, sour, tart