silver hair; gray hair; grey hair
was it?; I think it was ...; if I've got it right; (I, we) used to ...; I remember ...; it was ...
experiment; experimentation
and; moreover; besides; as well as; and on top of that; at the same time
assistant; associate; duplicate; copy; adverb
(national) capital (city); metropolis
sharpshooting; shooting; sniping; setting a goal and carrying it out
interception; monitoring; tapping
preservation; conservation; maintenance; integrity
unable to do (as one wishes); able to do only with great effort; almost impossible to do; beyond one's control; not always turning out as one wishes; not going the way one wants it to
to hinder; to obstruct; to adversely affect
to pass (the night); to spend; to reveal; to divulge; to prove; to verify
outflow; effluence; efflux; outflow (of people, capital, etc.); drain (of gold, talent, etc. from a country); leak (e.g. of personal information)
willingly; voluntarily; of one's own accord
(idle) curiosity; fancifulness; eccentricity; person with unusual tastes; eccentric; oddball
to have a limit; to go too far (e.g. of a joke)
to perceive; to sense; to take in; to grasp; to feel
suddenly; unexpectedly; by chance; accidentally; lightly; nimbly
blunder; fault; error; mistake; failure; disgrace
even; flat; level; calm; peaceful; uneventful
genuine; real; authentic; full-scale; full-blown; all-out
calculation; computation; bill; check; consideration; allowance
insurance; guarantee; warranty
destructive blast; blowing up; explosion
switch; switch; points; switch (from one thing to another); change
to push; to thrust; to press (down); to push (e.g. a button); to stamp (e.g. one's name); to affix (a seal); to affix (e.g. gold leaf)
error; fumble that leads to failing to put out a runner
while (one is at it); when; on the occasion of; at the same time (as); on one's way (to); by the way
swallowing; understanding; comprehension; apprehension
before very long; soon; someday; of the previously mentioned; of that number; among them
looking up (e.g. a word in a dictionary); search (e.g. on the Internet); retrieval (of information); reference
direction; orientation; bearing; course (e.g. of action)
strong-willed; strong of heart
mostly; almost; nearly; roughly; approximately; about
in good health; alive and well; going strong
to start to move; to get going; to come alive
direction; district; area; field (e.g. of study); sphere; quarter