あの双子は瓜二つだ。

あの双子は瓜二つだ。

Those twins look like two peas in a pod.

あの双子(ふたご)は瓜(うり)二(ふた)つだ。

Ano futago wa uri futatsu da.

彼の (あの、かの)

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

双子 (ふたご、そうし)

twins; twin

は (は)

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

瓜 (うり、ウリ)

melon; gourd

二つ (ふたつ)

two

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ソウ、ふた、たぐい、ならぶ、ふたつ

Meanings: pair, set, comparison, counter for pairs

Readings: シ、ス、ツ、こ、 -こ、ね

Meanings: child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac

Readings: カ、ケ、うり

Meaning: melon

Readings: ニ、ジ、ふた、ふた.つ、ふたたび

Meanings: two, two radical (no.2)