standard-bearer

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Being the standard-bearer for the drugs industry has never been easy, but the job will get even harder.
作为制造业的旗手从来都不是一件易事，并且这份工作越来越难。
Mr Medvedev has consistently disappointed those who had hoped he would be the standard-bearer of an independent, reformist tendency in Russia.
俄罗斯有人曾希望梅德韦杰夫是一个独立的、有改良主义倾向的旗手，可是他一直让这些人失望。
Though regarded as America’s leading standard-bearer for Keynesian economics, he called himself a “cafeteria Keynesian”, just picking the bits he liked.
纵使萨缪尔森被推崇为凯恩斯经济理论的旗手，却自称“自助餐厅凯恩斯主义者”，只挑选自己喜欢的部分。

And with Mr Alvarez's resignation, the Alliance has lost the standard-bearer for its crusade against corruption.
ECONOMIST: Argentina
But the shy, sometimes awkward, Mr Lugo was an unlikely standard-bearer for a modernised Paraguay.
ECONOMIST: Paraguay’s impeachment

the person or thing that seems to lead a group of people having similar ideas or moral opinions

If you describe someone as the standard-bearer of a group, you mean that they act as the leader or public representative of a group of people who have the same aims or interests.