実行は理論と並んでいかなければならない。

Practice must go hand in hand with theory.

実行(じっこう)は理論(りろん)と並(なら)んでいかなければならない。

Jikkō wa riron to narandeikanakerebanaranai.

実行 (じっこう)

practice; practising; performance; execution (e.g. program) (programme); realization; realisation; implementation

は (は)

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

理論 (りろん)

theory

と (と)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

並ぶ (ならぶ)

to line up; to stand in a line; to rival; to match; to equal

Readings: ジツ、シツ、み、みの.る、まこと、みの、みち.る

Meanings: reality, truth

Readings: コウ、ギョウ、アン、い.く、ゆ.く、 -ゆ.き、 -ゆき、 -い.き、 -いき、おこな.う、おこ.なう

Meanings: going, journey, carry out, conduct, act, line, row, bank

Readings: リ、ことわり

Meanings: logic, arrangement, reason, justice, truth

Reading: ロン

Meanings: argument, discourse

Readings: ヘイ、ホウ、な.み、なみ、なら.べる、なら.ぶ、なら.びに

Meanings: row, and, besides, as well as, line up, rank with, rival, equal