“existence doubtful”的概念、定义、翻译、参考文献-科学参考

单词	existence doubtful
释义	existence doubtful [ig`zis·tǝns `dau̇t·fǝl] ^NAVIGATION In marine operations, expression used principally on charts to indicate the possible existence of a rock, shoal, and so on, the actual existence of which has not been established.
随便看	acquired acquired drive acquired immune deficiency syndrome acquired immunity acquired immunological tolerance acquisition acquisition and tracking radar acquisition tone Acrania acrania acrasia Acrasiales Acrasida Acrasieae acrasin Acrasiomycota acraspedote acre Acree's reaction acre-foot acre-foot per day acre-ft/d acre-in. acre-inch acre-yield

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