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propulsion technology
 propulsion technology
avia. 推进技术
| validation
 validation
gen. 批准
fin. 认定其有效性
food.ind. sec.sys. 变异因素
IMF. 核实支出; 核实
interntl.trade. 使生效
math. 确认
space 审批; 验证

to phrases
propulsion technology
avia. 推进技术
propulsion technology validation
: 14 phrases in 3 subjects
Aviation6
Germany1
Space7