the forefront
noun [ S ] uk/ˈfɔː.frʌnt/ us/ˈfɔːr.frʌnt/
最显要的位置；最重要的地位
the most noticeable or important position
She was one of the politicians at/in the forefront of the campaign to free the prisoners. 她是身处释放犯人运动风口浪尖的政治家之一。
His team is at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。