立彬の日本語

それは難題だ。

tbd

That's a tall order.
984
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それ， 其れ
1. that, it 2. then, that point (in time), that time 3. there 4. you
tbd
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難題， なんだい
1. difficult problem, challenge
难题，棘手的问题，挑战
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は
は
1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis
指示句子的主题
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だ
だ
1. be, is
断定助动词，是，是也
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