立彬の日本語
砦は不意に攻撃された。
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The fort was attacked by surprise.
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砦， 塁， 寨， とりで
1. fort, fortress, stronghold, fortification
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不意， ふい
1. sudden, abrupt, unexpected, unforeseen
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攻撃， こうげき
1. attack, assault, raid, onslaught, offensive
2. criticism, censure, denunciation, condemnation
攻击
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される， 為れる
1. to be done (to someone or something)
2. to do, to be doing
(对某人或某物)进行某种动作，する的被动形态；(对某人或某物)正在做，即将做
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