名詞 vanguard:

1. the leading units moving at the head of an army
   同義詞：van
2. any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts)
   同義詞：avant-garde, van, new wave
3. the position of greatest importance or advancement; the leading position in any movement or field
   同義詞：forefront, cutting edge