These organ systems--your respiratory and circulatory systems, digestive and excretory system, etc.--merrily breathe, circulate, digest and excrete away without us having to do much directly to help them.
(These organ systems; merrily breathe; ) (us; to do directly; to help them) Context(us to do directly,List([161, 190))):(us; to do directly to help; them)
us to do directly,List([161, 190))
These organ systems us us
merrily breathe to do directly to do directly to help
to help them
them