when it comes to ...; where ... is concerned; if it's the case that ...; if it turns out that ...; if it's true that ...
foreign enemy; outside invader
some; any; in any way; of some kind; of some sort
accident; incident; trouble; circumstances; reasons
single word; a few words; brief comment
appearance; arrival; make one's appearance
main force; chief object; mainline
aggression; invasion; raid
two times; twice; two degrees
tangent point; point of contact; contact (electrical, etc.); point of agreement; common ground
face; mask; face guard; (in kendo) striking the head; surface (esp. a geometrical surface); page; aspect
every part of the world; all over the world; the four corners of the world
large quantity; massive (quantity); mass (e.g. mass production, mass transit, mass destruction)
only natural; no wonder; as expected; of course; as it should be
in succession; one by one
vigilance; caution; alertness; precaution; being on guard
magical powers; supernatural powers; spell; charm
numerical value; numerics; reading (on a meter, etc.)
resembling closely; being strikingly similar; bearing a strong likeness
medium; average; moderation; middle school; China; volume two (of three); during (a certain time when one did or is doing something)
moral duty; moral obligations; justification; pretext; just cause
towards; against; regarding; in contrast with
double; twice (as much); times (as much); -fold; 1-nth; 1 to n
to be seething (with anger); to be frenzied; to be menacing; to be murderous
natural; understandable; reasonable; no wonder
thought; imagination; mind; desire; wish; love
somehow (or other); for some reason; without knowing why; something (or other); some ... or other
doubtful; questionable; uncertain; disputable; suspicious
mistake; error; accident; mishap; improper conduct (e.g. between man and woman); indiscretion
to fold one's arms; to link arms with someone
agreement; consent; same opinion; same view; same meaning
new type; new style; new model; new strain (e.g. infectious disease)
misrecognition; mistaking (x for y)
indication; expression; display; displaying; representation; (copyright) attribution
location information (as used by location-based services, e.g. GPS position)
to pile up; to heap up; to stack up; to repeat many times over; to go through repeatedly; to accumulate
movement; transfer; migration; mobile; moving; traveling
direction; way; point of the compass; cardinal direction; method; means