Answer: It means that there is no need to mention the subject until it is closer or becomes important.
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d) online catalog</span>
An online library catalog is an electronic bibliographic database that describes the books, videotapes, periodicals, etc. carried by a particular library. The library catalogue is the resource that can help you identify what a library has in it's <span>holdings.</span>
Answer:
I think it means calculations involved in determining how much fuel the EDS needs to safely make it down to the planet with its cargo.
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