その講堂（の外壁）はひどく黒ずんでいる。その原因の一つは酸性雨である。

Sentence Analyzer

English Translation

The outside walls of the auditorium are terribly stained. It is, in part, due to acid rain.

Furigana

その講堂(こうどう)（の外壁(がいへき)）はひどく黒(くろ)ずんでいる。その原因(げんいん)の一(ひと)つは酸性雨(さんせいう)である。

Romanji

Sono kōdō no gaiheki wa hidoku kurozundeiru. sono gen'in no hitotsu wa sanseiu de aru.

Words

其の (その)

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

講堂 (こうどう)

auditorium; lecture hall

の (の)

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

外壁 (がいへき、そとかべ)

outer wall

は (は)

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

酷い (ひどい)

cruel; heartless; hard; harsh; severe; violent; intense; strong; heavy; extreme; very bad; terrible; awful; excessive; exorbitant; unreasonable; outrageous; unfair; unjust

黒ずむ (くろずむ)

to blacken; to darken

原因 (げんいん)

cause; origin; source

一つ (ひとつ)

one; for one thing; only; (not) even; just (e.g. "just try it")

酸性雨 (さんせいう)

acid rain

だ (だ)

be; is; indicates past or completed action; indicates light imperative

或 (ある)

a certain ...; some ...