立彬の日本語
地表の約４分の３は水で成り立っている。
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About three fourths of the earth's surface consists of water.
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地表， ちひょう
1. surface of the earth, ground surface
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約， やく
1. approximately, about
2. promise, appointment, engagement
3. shortening, reduction, simplification
4. contraction (in phonetics)
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分の， ぶんの
1. -th (e.g. one fifth)
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成り立つ， 成立つ， なりたつ
1. to consist of, to be made up of, to be composed of
2. to be concluded (e.g. of an agreement), to hold true (e.g. of a theory), to be valid
3. to be viable (of a business, lifestyle, etc.), to carry on, to keep going
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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
で
1. at, in
2. at, when
3. by, with
4. within, in
5. and then, so
6. and, then
7. let me tell you, don't you know
表示范围
