vehicle / train car

a car, an automobile, a carriage, a cart / a wheel, a caster / something wheel-shaped / a style of 紋 (mon, “family crest”) / short for 車海老 (kuruma ebi): a prawn

optimization

to optimize

stairs used in emergencies

state of emergency (unusually difficult or dangerous situation)

passive, inactive, timid

-ive, -like, -ish, -ic, -ical, -y, kind of, sort of

target / bright, clear

Alternative spelling of 敵: (rare) enemy, opponent