early warning system
noun [ C ] uk/ɜː.li ˈwɔː.nɪŋ ˌsɪs.təm/ us/ɝː.li ˈwɔːr.nɪŋ ˌsɪs.təm/
（军事上能及早发现危险的）预警系统
a military system of radar stations intended to give a warning as soon as enemy aircraft or bombs come near
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