intractable (diseases); hard to cure; rebellious; insurgent; refractory
nature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); gender; -ty
nerve; nerves; sensitivity
disease; ailment; illness
study; research; investigation
to advance; to move forward; to carry forward (plans, work, etc.); to proceed with; to raise; to elevate
electricity; (electric) light
stimulus; impetus; incentive; encouragement; motivation; provocation
to join together; to combine; to join up
via; through; by doing; by means of; using
as one expects; as one wants; to one's satisfaction; as one sees fit
area; domain; territory; field; range; region
formation; molding; making up; repair (e.g. plastic surgery); replacement; -plasty
high; tall; expensive; high-priced; high (level); above average (in degree, quality, etc.)
guidance; leading; induction; introduction; incitement; inducement
originally; primarily; essentially; intrinsically; proper; rightful
to hold (in one's hand); to take; to possess; to have; to maintain; to keep; to last
cranial nerves; cerebral nerves
cell; cell (in an organization, esp. a communist party)
function; facility; faculty; feature
degree; amount; grade; standard; of the order of (following a number); about
to use (a thing, method, etc.); to make use of; to use (a person, animal, puppet, etc.); to employ; to use (time, money, etc.); to spend
fellow; mutual; companion; comrade
combination; union; binding; bond
part (esp. of the body); region; site; cut (of meat)
present condition; existing state; status quo; current state
double; twice (as much); times (as much); -fold; 1-nth; 1 to n
to increase; to add to; to augment
to be able (to); to be possible (to)
effect; effectiveness; efficacy; effects (e.g. sound effects, visual effects, special effects)
to wake up; to awake; to awaken to (instinct, ability, perception, etc.); to become aware of; to come to one's senses
maximum; to the maximum degree; to the full
practical use; application; conjugation; inflection
next; following; subsequent; stage; station
stage; step; level; rank; order; stairs
of course; certainly; naturally
clinical study; clinical trial
abruptly; suddenly; all of a sudden; without warning