gōng / chéng / shī / cè / liáng / le / wū / dǐng / de / qīng / xié / dù / yǐ / què / bǎo / pái / shuǐ / shùn / chàng工程师测量了屋顶的倾斜度,以确保排水顺畅。The engineer measured the roof's slope to ensure proper drainage.