to take lessons in; to be taught; to learn (from a teacher); to study (under a teacher); to get training in
which (of three or more); well; now; c'mon
it is not possible (to, that); there is no such thing as
gravity; gravitation; gravitational pull
several; a number of; quantity; amount; counting; figures; number
to smoke; to breathe in; to suck; to sip; to absorb; to soak up
six; six years of age; six o'clock (old time system)
outline; survey; compendium
for example; for instance; e.g.
explosive; blasting powder
composition; synthesis; composite photo; (function) composition
system; lineage; corollary; system (range of strata that correspond to a particular time period); (taxonomical) series
ignition; catching fire; firing (e.g. gun); discharging
chemical substances; chemicals
assistance; support; subsidy; supplement; auxiliary; subsidiary
walking; pace; step; course (of history, one's life, etc.); history; pitch (of a screw, etc.)
tendency; trend; inclination
center; centre; middle; -centered; -centred; -focused
job; work; duties; trade; skill
multisystem; polyphyletic
equality; equal; same rights; same rank; equivalence
to operate (e.g. a machine); to handle; to have a good command of (a language); to play proficiently (of a musical instrument); to work (a puppet); to pull the strings of a puppet
grounding (in a skill or subject); knowledge; training; achievements; attainments; accomplishments
to look displeased; to frown; to scowl; to look grave; to look serious
explanation; exposition; description; account; caption; legend
to listen attentively to; to be lost in
root; source; origin; cause
embodiment; manifestation; materialization; materialisation; expression; indication
form; shape; figure; visage
form; method; system; formula
not only ... (but also); not just; as well as
rearrangement (of classes); recomposition; recombination; reclassification
various; varied; diverse; all sorts of
powerful; strong; forceful; reassuring; encouraging
same; identical; equal; anyway; anyhow; in either case
to nod one's head; to nod yes; to agree
to tighten; to stiffen; to brace; to strain