立彬の日本語
事故の原因は不明だ。
tbd
The cause of the accident is unknown.
1,140
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事故， じこ， ことゆえ
1. accident, incident, trouble
2. circumstances, reasons
意外，事故
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原因， げんいん， げいいん
1. cause, origin, source
原因
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不明， ふめい
1. unclear, obscure, indistinct, uncertain, ambiguous
2. unknown, unidentified
3. ignorance, lack of wisdom, lack of insight
不明，不清楚；不知道
の
1. indicates possessive
2. nominalizes verbs and adjectives
3. substitutes for "ga" in subordinate phrases
4. (at sentence-end, falling tone) indicates a confident conclusion
5. (at sentence-end) indicates emotional emphasis
6. (at sentence-end, risi...
句尾起强调作用；助词，表示所有关系
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调