爬山越岭

Explanation: Vietnam: Over; Ridge: mountains. Climb over mountains, across the mountains. Describe the hard field work or travel. 　　Source: Ming Luo, "Three Kingdoms" 114 back: "scared Deng Ai Qi Jia lost helmet, sat down to write a horse, mixed in among the military step, climbing uphill run away." 　　Examples: Ming Luo, "Three Kingdoms" 114 back: "scared Deng Ai Qi Jia lost helmet, sat down to write a horse, mixed in among the military step, climbing uphill run away."