exceptional; unusual; extraordinary; unprecedented; singular
medium; average; moderation; middle school; China; volume two (of three); during (a certain time when one did or is doing something)
unheard-of; unprecedented; unparalleled in history (unparallelled); record-breaking
sudden; abrupt; unexpected
flight (e.g. airline flight); trip (e.g. train trip); mail; post; opportunity; chance
noisy; confused; uproarious
this and that; one thing and another
guess; speculation; supposition
to fly about; to flutter about; to flit about; to fly past each other
surface-to-air missile; SAM
unidentified flying object; UFO
to take (someone) away; to carry off; to abduct; to kidnap
to gulp down; to swallow deeply; to understand; to take in; to engulf; to swallow up
etc.; et cetera; and so on
error; mistake; slip; bug
authorities; relevant authorities; authorities concerned; this office
delay; lag; postponement; falling behind
explanation; exposition; description; account; caption; legend
idle time; down time; window period
the other day; lately; recently; meanwhile; in the meantime
to sew; to stitch; to weave one's way (e.g. through a crowd)
low-altitude flying; having consistently poor results (grades, sales, etc.); barely scraping by; being on the verge of failing
expectation; anticipation; prediction; forecast; conjecture
site; point on a map; spot
far; distant; distant (past); remote (in time); distant (relationship or kinship); having little to do (with someone); far (from something else in quality, degree, etc.)
to be very far apart from; to be remote; to be quite different from
to have been decided (so) that; to have been arranged (so) that
to loiter; to putter; to prowl; to wander about; to roam about; to knock around
witnessing; observing; sighting
nonexistent; nil; none; nothing (at all); bugger-all
strangeness; abnormality; disorder
aviation; flight; flying; to fly; to take a flight
neighborhood; vicinity; environs; approaching