立彬の日本語
英語は外交や観光事業に有効である。
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English is useful in diplomacy and tourism.
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英語， えいご
1. English (language)
英语
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外交， がいこう
1. diplomacy
2. selling (e.g. door-to-door), canvassing
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観光， かんこう
1. sightseeing, tourism
旅游观光
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事業， じぎょう
1. business, enterprise, venture, (commercial) activity, (business) operation, industry
2. (social) project, undertaking, enterprise, work, activity, program, service
事业；项目，服务，工作等
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有効， ゆうこう
1. valid, effective
2. yuko (judo)
有效
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である
1. be, is
是、=です、=だ
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
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
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