１マイル歩くか歩かないうちに雷が鳴りだした。
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I'd hardly walked a mile when it began to thunder.
I had hardly walked a mile when it began to thunder.
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ないうちに， ない内に， 無い内に
1. before it becomes (verb), before (an undesirable thing occurs)
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鳴り出す， 鳴りだす， なりだす
1. to begin making a sound (ringing, singing, crying, etc.)
开始发出声音（如铃声、歌声、哭声等）
が
1. indicates the subject of a sentence
2. indicates possession
3. but, however, (and) yet, though, although, while
4. and
5. used after an introductory remark or explanation
6. regardless of ..., whether ... (or not), no matter ...
7. indicates a des...
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