fepri gismu

x1 is a/the lung [body-part] of x2; [metaphor: breathing/respiratory apparatus/bellows].

Also (adjective:) x1 is pulmonary. See also pambe, vasxu.


In notes:

pambe
x1 is a pump/injector [tool/apparatus] pumping/inserting fluid x2 to x3 from x4 by means x5.
vasxu
x1 breathes/respires x2 [gas].
cenrini
x1 is a/the kidney [body-part] of x2