徑向掃描旋轉(zhuǎn)系統(tǒng) system trace: 系統(tǒng)跟蹤trace system: 描繪系統(tǒng)rotation system: 輪轉(zhuǎn)配合打法; 輪作制度trace contour system: 直接等高縛法crop rotation system: 輪作制度下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯