该差值，如果存在，叫做未说明的时间（unaccounted for time）。
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unaccounted for time
时间不明
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At the same time, all the transactions are unaccounted for and cost the government's hundreds of millions of dollars in lost tax revenue.
BBC: How does illegal sports betting work and what are the fears?
And the problem is that the pain and time of tax accounting, tax preparation, is entirely unaccounted for in the deliberations of those who design the tax system.
FORBES: A Modest Proposal For Tax Reform: Make The IRS Pay Us For Filing A Return
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