“countdown”的概念、定义、翻译、参考文献-科学参考

单词	countdown
释义	countdown [`kau̇nt´dau̇n] ^{AEROSPACE ENGINEERING} 1. The process in the engineering definition, used in leading up to the launch of a large or complicated rocket vehicle, or in leading up to a captive test, a readiness firing, a mock firing, or other firing test. 2. The act of counting inversely during this process. ^{COMMUNICATIONS} The ratio of the number of interrogation pulses not answered by a transponder to the total number received. ^ENGINEERING A step-by-step process that culminates in a climatic event, each step being performed in accordance with a schedule marked by a count in inverse numerical order.
随便看	dumpy level cybotaxis cybrid Cycadales Cycadatae Cycadeoidaceae Cycadeoidales Cycadicae Cycadofilicales Cycadophyta Cycadophytae Cycadopsida cyclamate cyclane Cyclanthaceae Cyclanthales cyclase cycle cycle annealing cycle-bound program cycle checkout cycle count cycle criterion cycle delay selector cycle gas

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