Quadruple VS
Synonym Boundary: "開ける", "開通する", "散開星団", "公開市場操作"
All represent the core concept "open", but require precise selection.
Japanese Option A
開ける
あける (akeru)
N5 / CEFR
Japanese Option B
開通する
かいつうする (kaitsū suru)
N3 / CEFR
Japanese Option C
散開星団
さんかいせいだん (sankaiseidan)
C2 / CEFR
Japanese Option D
公開市場操作
こうかいしじょうそうさ (koukaishijousousa)
C2 / CEFR
Quadruple VS Nuance Contrast & Social Differences
When expressing "open" in Japanese, you must carefully distinguish between "開ける", "開通する", "散開星団", "公開市場操作" based on context.
- 開ける (あける (akeru) - Level: N5): Maps to "to open (something)" and is used when Transitive verb.
- 開通する (かいつうする (kaitsū suru) - Level: N3): Maps to "to open (for traffic), to be completed (e.g., a tunnel, bridge, line)" and is used when Used for infrastructure like roads, railways, tunnels, or new services becoming available for public use. It's an intransitive verb..
- 散開星団 (さんかいせいだん (sankaiseidan) - Level: C2): Maps to "Open cluster" and is used when Essential structural term in CEFR C2 vocabulary syllabus..
- 公開市場操作 (こうかいしじょうそうさ (koukaishijousousa) - Level: C2): Maps to "Open Market Operations" and is used when Essential structural term in CEFR C2 vocabulary syllabus..
Context for "開ける"
ドアを開けてください。
Please open the door.
Context for "開通する"
新しい高速道路が来月開通する予定だ。
The new highway is scheduled to open next month.
Context for "散開星団"
私は散開星団に興味があります。
I am interested in Open cluster.
Context for "公開市場操作"
私は公開市場操作に興味があります。
I am interested in Open Market Operations.
Synonym Mastery Challenge
Which Japanese word perfectly fits this blank space?
Fill in the blank: "ドアを開けてください。" (Meaning: "Please open the door.")
🎉 Correct Answer!
Remember: "開ける" is correct here because it represents "to open (something)" in the context: "Please open the door.".