concrete; definite; specific; material; substantial
black box; flight recorder; black box (system or device with hidden internal workings)
to be worried; to be troubled
lesson; class; teaching; instruction; classwork; schoolwork
entrance (on the stage); appearance (in a book, film, etc.); appearance (on the scene); arrival (on the market); emergence
often; again and again; over and over again; repeatedly; frequently
raising (a question); posing (a problem); instituting (a lawsuit); lodging; (arch.) lifting up
evaluation criteria; evaluation standard
most suitable; optimum; optimal; best
to draw (conclusion); to deduce; to derive
structure; construction; arrangement; plan; plot; contrivance
essential; important; crucial; vital; main
standard; criterion; norm; benchmark; measure; gauge
construction; building; putting up; erecting; creation; formulation
ethnic food (esp. Asian, African, etc.)
to come true (of a dream, wish, etc.); to be realized; to be fulfilled; to be granted; to be answered (of a prayer); to be requited (of love)
observation; survey; measurement; opinion; prediction; thinking
artificial general intelligence; AGI
to follow around; to shadow; to tag along; to haunt one (e.g. feeling, failure); to follow one
to be clear (of a sight, sound, colour, etc.); to be bright; to be clear-headed; to be alert; to look upbeat; to be perky; to master (a skill)
dark brown; colour of tanned skin
in confusion; in a fluster; in bewilderment; sobbing; tearfully; trembling (voice)
finally; after; following; at the end (of)
stillness; rest; being stationary; standing still; coming to a standstill
the reverse (side); back (side); other side; hidden side; behind the scenes
direction (of a play, film, etc.); production; organization (of an event); arrangement; staging (for effect)
to gaze (at); to stare intently (at); to look fixedly (at); to fascinate; to enchant; to possess
to blow (of the wind); to blow (one's breath); to breathe out; to play (a wind instrument); to blow (a whistle, trumpet, etc.); to emit (smoke, fire, etc.); to spout
tottering; staggering; faltering; reeling
to jump up; to start up; to leap to one's feet; to fly away; to take off
to infer; to figure out; to get an idea of; to tell; to imagine; to guess
to take good care of; to treasure; to value; to hold dear; to prize; to cherish
to push someone (towards); to encourage someone
tip of nose; before one's eyes; under one's nose; tip (of something)
flapping of wings; wingbeat; flap; flutter
to cross (e.g. road); to traverse
oh; right; I see; OK; gotcha
unbecoming; improper; unsuitable; ill-matched; unworthy of
to ask again; to repeat one's question; to ask back; to ask in return; to counter
to follow with one's gaze; to follow with the eyes
to lean over (and cover with one's body); to bend over (someone); to (stand tall and) lean on (someone); to weigh on one; to bear (heavily) on one; to lie on one
silence; being silent; quiet; reticence; inaction
mouthful; morsel; gulp; sip; one word; in short