i learned roofing
我学会了盖屋顶
以上为机器翻译结果，长、整句建议使用 人工翻译 。
From my own experience installing roofing and siding, I learned about suppliers who were big on promises, but small on follow-up.
从我安装屋面和壁板的经验，我知道大供应商是重承诺的，小供应商是因循守旧的。
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