to concern; to be related
deep; profound; dense; thick; close (relationship); intense; strong
necessary; needed; essential; necessity; need; requirement
wherein; therein; thereinto
such ... as; or some such
system; lineage; corollary; system (range of strata that correspond to a particular time period); (taxonomical) series
use; exercise (of one's right, authority, power, etc.)
convenient; handy; useful
reappearance; reemergence; return; reproduction; reenactment; recreation
difficulty; hardship; trouble; infeasibility; inability (to carry out)
distinction; difference; separate; different; exception; exclusion
to touch; to feel; to touch (with); to experience; to come in contact with; to touch on (a subject); to allude to
strengthening; intensifying; reinforcement; enhancement; solidification
via; through; by doing; by means of; using
to urge; to encourage; to press; to stimulate (e.g. growth); to hasten (e.g. development); to quicken
the more ... the more ...; as; (arch.) while; (arch.) during; (arch.) because; (arch.) since
possible; likely; probable
endorsing and questioning the preceding statement; lamenting reflections on the preceding statement
still; even now; to this day
to accept; to receive; to agree
difficult to ...; hard to ...
thought; imagination; mind; desire; wish; love
it is assuredly (that)...; can say with confidence that it is...
leukocyte; leucocyte; white blood cell
work; labor; achievement; performance; salary; income
natural killer cell; NK cell
cell; cell (in an organization, esp. a communist party)
attack; assault; raid; criticism; censure; denunciation
exclusion; removal; rejection; elimination; abatement; lifting (sanctions, etc.)
to turn one's head; to look over one's shoulder; to turn around; to think back (on); to reminisce; to look back (on)
diagnosis; medical examination
centre; center; middle; capital; seat of government
temple; sacred place; shrine; sanctuary; tabernacle
detailed; full; minute; knowing very well; knowledgeable (about); well-acquainted (with)
to see (a doctor, etc.); to consult (someone)
death; decease; (arch.) death penalty (by strangulation or decapitation); (an) out
tear; tears; lachrymal secretion; sympathy