求翻译：由于施工企业具有生产周期长、生产的流动性、生产的单件性、施工容易受自然影响的特点，因此在应用建造合同会计准则时，施工企业不仅要成立专门的建造合同领导小组，而且还要在下属子企业或项目部成立具体的执行管理小组，负责具体的执行工作。建造合同总收入和总成本的预计应遵循施工前注重事实与证据相结合的原则，合理预计；在施工过程中及时根据合同变更、索赔、奖励等执行情况修正建造合同总收入和总成本的预计。是什么意思？

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Since construction enterprise with production long cycle and production of mobility, production of single pieces are vulnerable to natural effects, and the construction of the features in the application, the construction contract accounting guidelines, construction enterprises not only have to set

Because the construction enterprise has the production cycle long, the production fluidity, the production single unit, the construction easily the original influence characteristic, therefore in application construction contract accountant time criterion, not only the construction enterprise needs

Because of the long production cycle, production of construction enterprise mobility, production, construction of single pieces easily under the influence of natural features, so when the accounting standard for application in the construction contracts, construction contract in construction enterpr