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   English ⇄
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design, development, test and evaluation
avia. 设计，研制，试验和鉴定; 设计、研制、试验和评估
earth.sc. 设计、研制、试验与鉴定
space 设计、研制、试验和鉴定
 English thesaurus
design, development, test and evaluation
abbr. ddt&e

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