彼らは互いに対戦する

Meaning
they play against each other

Vocab used in this sentence

he, his, him, boyfriend
la, ra, from, et al
a, the, is, am, are, will
互い
each, each other, mutual, reciprocal
in, to, on, at, into, upon
対戦
play, match, fight, battle, competition, vs
する
to, make, to do, to make, to perform, to conduct

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