当费用更改是对贵方有利，或该变更出于我方无法控制的外部环境条件，我方可自行更改费用而不需予以通知。
We may vary the Charges without notice when the change is to your advantage or the grounds for changes are due to external circumstances beyond our control.
遗憾的是对于这些附加费用我们无法控制。
Unfortunately we have no control over the amount of these additional charges.
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