立彬の日本語
１９世紀末になって初めて植物の品種改良は科学の一分野となった。
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Not until the end of the nineteenth century, did plant breeding become a scientific discipline.
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世紀末， せいきまつ
1. end of a century (esp. 19th), fin-de-siècle
2. end of the world (esp. in fiction), apocalypse
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になって初めて， になってはじめて
1. (it was) not until, (it was) only when
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植物， しょくぶつ
1. plant, vegetation
植物
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品種改良， ひんしゅかいりょう
1. selective breeding
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科学， かがく
1. science
2. to think about scientifically, to think in terms of science
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一分野， いちぶんや
1. one field, a division, a branch (e.g. of study, etc.)
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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