"处在最前沿的位置" can be translated into English as "be at the forefront" or "be in the leading position".
"Be at the forefront" is a commonly used phrase that conveys the idea of being at the very front or the cutting edge of something, such as technology, research, or a field of activity.
"Be in the leading position" also effectively communicates the concept of being in a prominent or advanced position within a certain context.
Both expressions are appropriate depending on the specific context and the nuance you wish to convey. For example:
"Our company is at the forefront of technological innovation."（我们公司在技术创新方面处于最前沿。）
"This research team is in the leading position in the field of biotechnology."（这个研究团队在生物技术领域处于领先地位。）