更正系数是补退电费的重要依据，但更正系数中的功率因数角也是未知数。
Correction coefficient is important to electric charge refund, but its power factor Angle is unknown.
在最后时刻比利时人几乎就要扳平比分，他们的头球击中了横梁，后来的补射又因为越位在先，米兰终于从客场全身而退。
The Belgians nearly grabbed an equaliser in the final minutes when a header came back off the bar but play was then halted for offside and Milan were home and dry.
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