单词	双重负担
释义	双重负担double burden
随便看	navigational microfilm projector navigational parameter navigational plan navigational planet navigational planets navigational plan; sailing plan navigational plot navigational proportional navigational satellite navigational satellite tracking network navigational satellitracking navigational sensor navigational stars navigational table navigational table--nautical tables navigational telex navigational telex {= navtex} navigational telex {=navtex} navigational trace map navigational triangle navigational warning navigational warning signal navigational watch navigation and control of interplanetary flight navigation and position-finding