engine; agency; organisation; system; facility
organization; organisation; structure; construction; system (e.g. railroad, transport, party, etc.); tissue; texture (of a rock)
elementary; basic; rudimentary
stage; step; level; rank; order; stairs
not yet known; unknown; strange
reproducibility; repeatability; duplicability
to raise; to raise up; to wake; to wake up; to cause; to bring about; to start
scale; scope; plan; structure
regulation; adjustment; control
to be effective; to take effect; to work; to function well; to be possible (to do, use, etc.); to be able to
difficult to ...; hard to ...
to be due to; to be caused by; to depend on; to turn on; to be based on; to come from
surroundings; environs; circumference
to give (esp. to someone of lower status); to bestow; to provide; to afford; to assign; to cause
influence; effect; to influence; to affect; to have an influence on
big; large; loud; extensive; spacious; important
the person in question; the person themselves; said person
dangerous; in danger; facing imminent danger; precarious (situation); perilous (state, balance, etc.); in doubt
reason; cause; circumstances
that day; the very same day
the other day; a few days ago
everyone; everybody; all; everything; all
ripening (of a crop); crop; harvest
herculean strength; mountain carrier-guide
what kind of; what sort of; what; no matter what (kind of); whatever; any
honorific/polite/humble prefix; honorific suffix
hobby; pastime; tastes; preference; liking
once; one time; temporarily; for a moment; one degree; one tone
question; inquiry; enquiry
to surround; to encircle; to besiege; to lay siege to; to play (go, shogi, etc.)
to be popular (esp. with the opposite sex); to be well liked; to be pampered (spoiled, doted upon, etc.); to be welcomed
sexy; popular; well-liked
what is called; what they call; so-called
period (of life) when one is enjoying more romantic attention than usual
bad feeling; feeling bad; disagreeable; unpleasant; revolting; gross
laugh; laughter; smile; sneer; sex aids (e.g. dildos, pornographic books, erotic woodblock prints, etc.)
easy; simple; there's no way that ...