头号屋面承包商雇用的优势就是你能够得到专家的反馈你需要什么材料，无论审美和现实的原因。
The number one advantage of hiring a roofing contractor is that you will be able to get expert feedback on what materials you need, for both aesthetic and practical reasons.
他们受雇于屋面和总承包商，或者有可能成为自雇人士。
They are employed by roofing and general contractors, or they may be self-employed.
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