このルールはすべての場合に当てはまる。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

rule

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

everything; all; the whole; entirely; completely; wholly; all

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

case; situation

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

to apply (a rule); to be applicable; to come under (a category); to fulfill