英语翻译the silt that had been moved by the boy began to once more fall to the bottomthat在句子里做什么成分once在句子里什么意思不对，是once more 为什么放在began to和fall之间

英语翻译
the silt that had been moved by the boy began to once more fall to the bottom
that在句子里做什么成分
once在句子里什么意思
不对，是once more 为什么放在began to和fall之间