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observing systems
 observing system
tech. 观察系统
| simulation experiment
 simulation experiment
avia. 模拟试验

to phrases
observing system
tech. 观察系统
observing systems: 60 phrases in 14 subjects
Aviation7
Desert science2
Earth sciences17
Ecology2
Electronics4
Environment1
Geography1
Geophysics4
Name of organization5
Remote sensing1
Space7
United Kingdom1
United Nations7
United States1