求翻译：施工期间，增项部分或设计更改产生的费用由甲方签字确认并付清款项后乙方方能施工，工期相应顺延。是什么意思？

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During construction, increase the part or design change the costs resulting from confirmed and signed by Party A and Party B Parties after payments can correspondingly extended construction and that the period of construction.

Construction period, increases the expense which an item of part or the design change produces after the party of the first part signature to confirm and to pay in full the fund the second party side to be able to construct, the time limit for a project postpones correspondingly.

During the construction, increased expenses associated with the part or design changes signed after confirmation and payment by the party a party b to party construction, duration extended accordingly.

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