Issued thundered loud. Such as thunder, cannon. Heng Qing adopted son "of insects recorded Man" Volume: "Yang Chuan boats out at sea, guns roar." Guo Xiaochuan, "into the fiery struggle" poem: "The road ahead is also often shrill roar of wind and rain and thunder. "Ji Xuepei" field in the chase ":" This voice was the same as in the fields by loud roaring, rolling forward. "