proof-of-concept; demonstration experiment; verification test
connection; attachment; changing trains; conjunction
to tie; to bind; to bear (fruit); to close (e.g. deal); to confirm; to connect (two distant places); to close tightly
shyness; bashfulness; shame
surroundings; environs; circumference
human being; human; person; character (of a person)
to ring an alarm bell; to sound a warning; to blow a whistle; to warn
technology; technique; technical
certainly; without fail; right and wrong; pros and cons
and so on; and so forth; et cetera; comment; criticism
to ask; to inquire; to blame (someone) for; to accuse of; to care about; to regard as important
(suffering) damage; injury; harm
to suffer; to groan; to be worried
people; men and women; each person; everybody
relief; aid; help; (religious) salvation; (Christian) grace
role; assignment; position (of responsibility); post; part (in a play, film, etc.); role
to sound; to ring; to resound; to echo; to roar; to rumble
to meet; to encounter; to see; to have an accident; to have a bad experience
calmly; quietly; gently; be quiet!
plan; scheme; (payment) plan; package; deal
gradually; steadily; slowly; little by little; step by step; by degrees
to cross the line; to go too far
reason; cause; circumstances
to sew; to stitch; to weave one's way (e.g. through a crowd)
to cross over; to cross; to pass through; to exceed; to surpass; to be more (than)
to persevere; to persist; to insist that; to stick to (one's opinion); to remain in a place; to stick to one's post
twice; again; second time
innocence; insentient (i.e. plants, inanimate objects, etc.); free from obstructive thoughts; to pester someone (for cash, etc.)
another time; again; over again; formally; especially; intentionally
dimly; faintly; absentmindedly; vacantly; idly; aimlessly
slight cold; bit of a cold; touch of a cold; lingering cold
poor physical health; bad shape
to continue; to last; to continue (without a break); to be unbroken; to occur again and again; to lead to; to connect to
image; figure; figure; form; image
hateful; abominable; poor-looking; amazing; fantastic; admirable