《明史·志·卷六十四》
制造浚川爬，用巨大木筏几百个，拖着木齿，随着潮水进退，敲打除去泥沙。
造浚川爬，用巨筏数百，曳木齿，随潮进退，击汰泥沙。
Manufacture a dredging boat, use hundreds of huge rafts, and drag the wooden teeth, and follow the ebb and flow of the tide, to knock and remove the mud and sand.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 造浚川爬，用巨筏数百，曳木齿，随潮进退，击汰泥沙。 [/INST] Manufacture a dredging boat, use hundreds of huge rafts, and drag the wooden teeth, and follow the ebb and flow of the tide, to knock and remove the mud and sand.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 造浚川爬，用巨筏数百，曳木齿，随潮进退，击汰泥沙。
user
Manufacture a dredging boat, use hundreds of huge rafts, and drag the wooden teeth, and follow the ebb and flow of the tide, to knock and remove the mud and sand.
assistant