安全性が改善されない限り、２０１０年までにジェット旅客機は週に１度の割合で空から落ちる事態になっている可能性があると、ボーイング社の分析は予測している。

safety; security

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

betterment; improvement; kaizen (Japanese business philosophy of continuous improvement)

limit; limits; bounds; degree; extent; scope; as far as possible; as much as possible; to the best of one's ability; very much; unless (after neg. verb); the end; the last; as long as; only

two

circle (sometimes used for zero); 'correct' (when marking); symbol used as a placeholder (either because a number of other words could be used in that position, or because of censorship); period; full stop; maru mark; semivoiced sound; p-sound

one; best; first; foremost; beginning; start; bottom string (on a shamisen, etc.)

year; many years; age; past one's prime; old age

until (a time); till; to; up to; to (a place); as far as; to (an extent); up to; so far as; even; only; merely

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

jet

passenger plane

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

week

degree (angle, temperature, scale, etc.); counter for occurrences and times; strength (of alcohol)

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

rate; ratio; percentage; proportion; comparatively; contrary to expectations

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

sky; the heavens

from (e.g. time, place, numerical quantity); since; from (originator); by; because; since; out of (constituent, part); through (e.g. window, vestibule); after; since

to fall down; to drop; to fall (e.g. rain); to sink (e.g. sun or moon); to fall onto (e.g. light or one's gaze); to be used in a certain place (e.g. money); to be omitted; to be missing; to decrease; to sink; to fail (e.g. exam or class); to lose (contest, election, etc.); to crash; to degenerate; to degrade; to fall behind; to become indecent (of a conversation); to be ruined; to go under; to fade; to come out (e.g. a stain); to come off (e.g. makeup); to be removed (e.g. illness, possessing spirit, name on a list); to fall (into someone's hands); to become someone's possession; to fall (into a trap); to fall (for a trick); to give in; to give up; to confess; to flee; to fall; to be defeated; to surrender; to come to (in the end); to end in; to fall (in love, asleep, etc.); to swoon (judo); to consent; to understand; to crash; to freeze; to die; to move to the depths

situation; (present) state of affairs; circumstances

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...

potentiality; likelihood; possibility; availability

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

analysis

prediction; estimation