usuallythe vanguard 1 the leaders of a movement in society, for example in politics, art, industry, etc （政治、艺术、工业等运动的）前锋，先驱: The company is proud to be in the vanguard of scientific progress. 该公司为走在科学进步的前列感到自豪。
2 the part of an army, etc that is at the front when moving forward to attack the enemy 尖兵；先头部队