gōng / rén / yòng / shuǐ / ní / chōng / tián / qiáng / shàng / de / liè / fèng / yǐ / fáng / yǔ / shuǐ / shèn / rù工人用水泥充填墙上的裂缝,以防雨水渗入。The workers filled the cracks in the wall with cement to keep rainwater from seeping in.