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advance guard

noun
🔊/ədˌvɑːns ˈɡɑːd/
🔊/ədˌvæns ˈɡɑːrd/
(also advanced guard)
[countable + singular or plural verb]
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  1. a group of soldiers who go somewhere to make preparations before other soldiers arrive先遣部队
    • (figurative) White blood cells may be considered the advance guard of the immune system.白细胞可以被认为是免疫系统的先驱。