每日钉一下（商战背后，“护城河” 为何成为企业生存的关键防线？）

Group 1 - Many investors aim to diversify their funds, covering both RMB and foreign currency assets, as well as stock and bond assets [1] - Dollar bonds are an important component of this diversification strategy [2] Group 2 - A free course is available that systematically introduces investment knowledge related to dollar bond funds [2] - Interested individuals can add the course assistant and reply with "美元债" to receive the course materials [3]