胃は内臓の一つである。

Meaning
the stomach is one of the internal organs

Vocab used in this sentence

stomach, abdomen, gastric, maw
a, the, is, am, are, will
内臓
internal organs, viscera, intestines, innards, visceral, guts, entrails, offal
to, of
一つ
one, single, once
in, at, on, with, by, over, through
ある
a, is, an, be, there is, to be, locate