layer;  stratum;  class;  stratum;  sheaf;  counter for stories (of a building)
 formation;  establishment;  conclusion (e.g. of a deal);  reaching (e.g. an agreement);  being valid (of a theory, argument, etc.);  holding
 stage (theatre, theater);  scene or setting (e.g. of novel, play, etc.)
 magic (illusion);  conjuring;  magic trick;  conjuring trick;  sleight of hand
 very;  awfully;  exceedingly;  (not) at all;  by no means;  simply (cannot)
 without;  but if;  otherwise;  or else
 expert (technical) knowledge;  expertise
 to need;  to demand;  to take;  to require
 if things go wrong;  if the worst happens
 life;  life force;  lifetime;  lifespan;  most important thing;  foundation
 quite capable of ...;  could happen;  not unlikely to
 that is to say;  so that means
 possible;  potential;  practicable;  feasible
 danger;  peril;  hazard;  risk
 potentiality;  likelihood;  possibility;  availability
 specific gravity;  relative density;  relative importance;  weight
 upper stratum (classes, stories, storeys);  upper layer;  layer above
 to stir;  to churn;  to rummage around;  to throw into confusion;  to throw into chaos
 to become clear (water, air, etc.);  to become transparent;  to resonate clearly (e.g. voice);  to become serene;  to become tranquil;  to pronounce as an unvoiced sound
 something like ...;  something called ...
 basis;  foundation;  grounds;  authority
 air;  atmosphere;  mood;  situation;  someone with no presence;  someone who doesn't stand out at all
 carbonic acid gas;  carbon dioxide;  CO2
 to change places;  to relieve one another;  to replace someone
 change;  variation;  variety;  diversity;  inflection;  declension
 to float;  to become merry;  to be cheerful;  to become loose;  to become unsteady;  to feel out of it;  to be cut off (e.g. from those around you)
 isolation;  cut off;  blockade;  quarantine;  interception;  deprivation
 besides;  in addition;  also;  moreover
 fingertip;  finger;  toe tip;  toe
 to take an attitude;  to take a stance;  to commit oneself;  to assume a position
 Second World War (1939-1945);  World War II;  WWII;  WW2
 administration;  governance;  the authorities;  authority
 under (influence, control, conditions, etc. of);  during (war, occupation, etc.)