feather; plume; wing; shuttlecock (in badminton)
steering; piloting; flying; management (of people); handling; manipulation
specific; particular; designated; specifying; designating; identifying
landing; alighting; touch down
imagination; supposition; guess
to make matters worse; besides; what's more; in addition; on top of that
trouble; burden; nuisance; care; dependence; support
to correct; to rectify; to reform; to straighten (one's posture, collar, etc.); to adjust
time tunnel (passageway enabling time travel)
the present; present time; as of; present tense; this world; this life
global scale; global magnitude; worldwide scale
increase; rise; growth; addition; increment
frequency (of occurrence)
eager; earnest; strenuous; fervent; assiduous; with utmost effort
to mind; to care about; to be an issue; to matter; to keep company; to care for; to interfere with
endurance; patience; perseverance; self-control; self-restraint
spike (on a shoe or tyre); stud; spiked shoes; spikes; injuring (an opposing player) with the spikes on one's shoes; spiking
occurrence; incidence; generation (of power, heat, etc.); production; ontogeny; development
everything; anything; nothing
to triumph; to be elated with success
the other day; previously; last time; last (Sunday, summer, etc.); previous (e.g. mayor, chapter)
course; route; course (of study); program; lane (in running, swimming, etc.); course (of action); policy
thorough; exhaustive; complete
main cause; primary factor
consideration; examination; investigation; study; scrutiny; discussion
to become loose; to slacken (e.g. rope); to become less tense; to relax; to slacken (e.g. coldness, supervision); to become lax; to become softer (e.g. ground, facial expression)
frontage; width (of a building, plot of land, etc.); breadth (e.g. of one's knowledge); scope (e.g. of one's work); range
extent; scope; sphere; range; span
collapse; crumbling; breaking down; (radioactive) decay; disintegration
to carry; to transport; to come; to go; to use (a brush, chopsticks, etc.); to move
research institute; (research) laboratory
confirmation; verification; validation; review; check; affirmation
the trouble is that ...; the problem is that ...; unfortunately; annoyingly