万が一， まんがいち， まんがいつ
1. (if) by some chance, by some possibility, in the unlikely event that, 10000 to 1
2. (unlikely event of) emergency, the worst(-case scenario)
万一，倘若，万分之一的概率下；（极不可能发生的）紧急情况，最坏（情况）
万が一彼がこちらへ来たらすぐに知らせます。
tbd
If he should come here, I will let you know at once.
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万が一気が変わったら、知らせて下さい。
tbd
If you change your mind, let us know.
If you should change your mind, let me know.
If you change your mind, let me know.
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万が一の場合に備えて貯金するのは賢明だ。
tbd
It is wise to save money for a rainy day.
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万が一の時のために、保険には入っておいたほうがいいよ。
tbd
Insurance is a good idea - just in case.
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万が一に備えて、武器になるものを探した。
tbd
I looked around for a weapon just in case.
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もし万が一彼女が日本に来るとすれば、ジェーンはとても喜ぶだろう。
tbd
If she should come to Japan, Jane would be very happy.
If for some reason she came to Japan, Jane would be very happy.
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もし万が一私が失敗したら両親は何と言うだろう。
tbd
If I should fail, what would my parents say?
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うちのチームが君のところのチームに負けるようなことが、万が一にもあれば、僕は首をやる。
tbd
I'll eat my hat if, by some chance, my team loses to yours.
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