difficult to understand; unintelligible; abstruse
private talk; confidential talk; secret talk
bound hand and foot; hedged in (e.g. by restrictions); immobile
negligent; careless; slipshod; slovenly; reckless; irresponsible
extensive knowledge; erudition
fee-charging; paid; not free; toll road
superficial; half-hearted; shallow
thirst; craving; thirst (for love, knowledge, etc.); hunger
year; age; years; past one's prime; old age
to originate with; to start with; to stem from
earthquake disaster; Great Kanto Earthquake (1923)
change; alteration; modification
since the dawn of history
hawks; hardline faction; hardliner
important position; strategic point; important point; main point; essentials
blind spot (on the retina); blind spot; weak point; loophole
armament; soldier's equipment
changing completely; transformation
scientific capability; scientific ability (e.g. of a student); scientific strength (e.g. of a country); level of technological development
beginning (of a century, etc.)
artificial muscle; synthetic muscle
assistance; support; subsidy; supplement; auxiliary; subsidiary
intelligence; intellect; brains
(item of) equipment; accessories (bike, auto)
proficiency; skill; experience
material civilization; material civilisation
equipping; installing; fitting; mounting; putting on
as time goes by; as time went by; with the passage of time; over time
fly (any insect of infraorder Muscomorpha); person of no worth; pisher; scrub
bag; sack; skin of an orange (and other like fruits); dead end; plot of land surrounded by water
to anticipate; to expect; to place confidence in; to put trust in; to find promising; to see good prospects (in)
rough estimate; rough calculation; expectation; anticipation; plan
mischief; prank; pastime; hobby; playing with (a lighter, etc.); fooling around with