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节(jiē )节(jiē )横(héng )筑(zhù )在(zài )沟(gōu )壑(hè )或(huò )山(shān )溪(xī )中(zhōng )的(de )小(xiǎo )水(shuǐ )坝(bà ),用(yòng )以(yǐ )调(diào )整(zhěng )坡(pō )度(dù ),减(jiǎn )缓(huǎn )流(liú )速(sù ),防(fáng )止(zhǐ )沟(gōu )溪(xī )被(bèi )水(shuǐ )冲(chōng )蚀(shí )刷(shuā )深(shēn )。
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