high speed; rapidity; rapid-service train (not as fast as express); rapid train
to look at; to gaze; to stare at
sometimes; occasionally; at times; seasonal; of the season; appropriate (for the season or occasion)
energy; energy; strength; energy source; energy resource; food energy
food; provisions; nourishment (mental, spiritual, etc.); sustenance (e.g. of one's life); source of encouragement
background; scenery; background (of an incident, situation, etc.); circumstances; backing; support (from behind the scenes)
up to now; so far; traditional; conventional; usual
many; much; majority (of); greater part (of); mostly; mainly
level; standard; water level
new era; new period; new age; new epoch
phase of decline; ebb; twilight
increase; rise; growth; addition; increment
decrease; reduction; decline
to turn; to shift; to alter; to distract
depopulation; declining population
to become weak; to decline; to wear; to abate; to decay; to wither
renewal; update; innovation; improvement
extinction; discontinuation; severance; rupture; to become extinct; to cease to exist
remarkable; striking; obvious
increase in sophistication; enhancement of functionality; increase in speed; upgrading
inheritance; succession; accession; share-alike
decline; degeneration; decay; waning; ebbing
to check; to stop; to keep back
difference; variation; difference
to fall into ruin; to be desolated
tree (e.g. Christmas); tree structure; tree diagram
remains; dregs; vestiges; remnant; residue
nuisance to other people; inconvenience to others
throughout; over a period of ...; over a span of ...
being actualized; becoming apparent; becoming tangible; surfacing
old age; old person; the old; the aged
train that stops at every station; local train
whispering; whisper; secret talk; murmur
to make good use of one's spare moments; to weave one's way (e.g. through a crowd)
to close (e.g. book, eyes, meeting, etc.); to shut
stockpile; reserves; storing; stocking up; laying in (supplies)