彼は太い首をしている。

Meaning
he has a thick neck

Vocab used in this sentence

he, his, him, boyfriend
a, the, is, am, are, will
太い
thick, fat, wide
neck, head, fired, first, chief, wrist
o, the, to, wo
and, shi, four, death
the, it, have
いる
are, to be, to stay, to have, necessary, to exist

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