They work by taking oxygen from the air we breathe in and then exchanging it for carbon dioxide, a deadly waste product made by the cells of the body.
(the air; breathe; L:in) (we; exchanging; it; for carbon dioxide; T:then) (a deadly waste product; made; by the cells of the body) (They; work; ) Context(They work,List([0, 9))):(They; work by taking; oxygen; from the air)
They work,List([0, 9))
the air we a deadly waste product They They
breathe exchanging made work work by taking
L:in
it for carbon dioxide T:then
by the cells of the body
oxygen from the air