一体， いったい
1. (what) the heck, (why) in the world, (who) on earth
2. one object, one body, unity
3. one form, one style
4. one Buddhist image (or carving, etc.)
5. generally, in general
一体；到底(怎么回事)；通常，一般来说
工業区と商業区が一体となった総合的な開発区を目指しております。
tbd
We are aiming for an integrated development zone that combines business and industrial quarters.
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今までいったい何をしていたんだ！
tbd
What have you been getting up to till now?!
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性能的には問題なかったんだけど、一体あたりにかかる費用があまりにも膨大で、コストパフォーマンスが悪いということでね。
tbd
There was nothing wrong with their ability, it was just that the expense for each unit was so vast that the cost performance was bad.
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一体何が彼らをそのような行動に駆り立てたのか？
tbd
What on earth spurred them to such an action?
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古賀、あんたの半生で一体何があったの？
tbd
Koga, what on earth happened in your youth?
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洋子は一体どこへ行ってしまったのだろう。
tbd
I wonder where Yoko has gone.
Where can Yoko have gone?
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万一明日彼が死んだら、君はいったいどうしますか。
tbd
If he should die tomorrow, what in the world would you do?
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万一この飛行機が乗っ取られたら、君は一体どうするだろうか。
tbd
If this airplane were to be hijacked, what in the world would you do?
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彼女は一体どうやってその試験をパスしたのかしら。
tbd
How did she ever pass the test?
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彼女は一体どうしちゃったのかしら。
tbd
I don't know what's got into her.
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