in case of failure
万一失败了，他会再试一试的。
S-he fail, he would try again.
youdao
万一失败，我还要试一试。
If I should fail I would try again.
我猜测他们担心我万一失败。的确不该妄想。
I guess they feared, in case I failed, that I really shouldn't try.
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