石油の発見は思いがけない幸運だった。

Sentence Analyzer

石油の発見は思いがけない幸運だった。

English Translation

The discovery of oil was a lucky accident.

Furigana

石油(せきゆ)の発見(はっけん)は思(おも)いがけない幸運(こううん)だった。

Romanji

Sekiyu no hakken wa omoigakenai kōun datta.

Words

石油 (せきゆ)

oil; petroleum; kerosene

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

発見 (はっけん)

discovery; detection; finding

は (は)

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

思いがけない (おもいがけない)

unexpected; contrary to expectations; by chance; casual

幸運 (こううん)

good luck; fortune

だ (だ)

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