Impossible in living animals, this is a tedious procedure in animal lungs or human material obtained at surgery or autopsy and is especially difficult for large lungs.
(this; is; a tedious procedure in animal lungs or human material obtained at surgery or autopsy) (a tedious procedure in animal lungs or human material; obtained; L:at surgery or autopsy) (this; is; especially difficult for large lungs)
this a tedious procedure in animal lungs or human material this
is obtained is
a tedious procedure in animal lungs or human material obtained at surgery or autopsy
L:at surgery or autopsy
especially difficult for large lungs