回答
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We're raising salmon eggs at elementary school.
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We're growing salmon eggs until they become fry.
ーWe're raising salmon eggs at elementary school.
「私たちは小学校で鮭の卵を育てています」
to raise salmon eggs で「鮭の卵を育てる」
ーWe're growing salmon eggs until they become fry.
「私たちは稚魚になるまで鮭の卵を育てています」
to grow salmon eggs で「鮭の卵を育てる」
to become fry で「稚魚になる」
ご参考まで!