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中国， ちゅうごく

1. China 2. Chūgoku region (western part of Honshu comprising the prefectures of Okayama, Hiroshima, Yamaguchi, Tottori and Shimane) 3. central part of a country, main region 4. province of the second lowest rank (ritsuryō system)

中国

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日本， にほん， にっぽん

1. Japan

日本

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約， やく

1. approximately, about 2. promise, appointment, engagement 3. shortening, reduction, simplification 4. contraction (in phonetics)

tbd

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倍， ばい

1. double, twice (as much) 2. times (as much), -fold 3. 1-nth, 1 to n, 1 in n

倍

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広さ， ひろさ

1. area, extent, dimensions, size 2. width, breadth

tbd

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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

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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

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だ

1. be, is

断定助动词，是，是也

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