A guided-missile destroyer attached to a destroyer flotilla with the navy under the PLA Southern Theater Command throws jamming bombs to make smoke screen to mask the movement during a maritime training exercise in waters of the South China Sea on August 14, 2019. Photo:eng.chinamil.com.cn

A guided-missile destroyer attached to a destroyer flotilla with the navy under the PLA Southern Theater Command throws jamming bombs to make smoke screen to mask the movement during a maritime training exercise in waters of the South China Sea on August 14, 2019. Photo:eng.chinamil.com.cn

A guided-missile destroyer attached to a destroyer flotilla with the navy under the PLA Southern Theater Command throws jamming bombs to make smoke screen to mask the movement during a maritime training exercise in waters of the South China Sea on August 14, 2019. Photo:eng.chinamil.com.cn

A guided-missile destroyer attached to a destroyer flotilla with the navy under the PLA Southern Theater Command throws jamming bombs to make smoke screen to mask the movement during a maritime training exercise in waters of the South China Sea on August 14, 2019. Photo:eng.chinamil.com.cn

A guided-missile destroyer attached to a destroyer flotilla with the navy under the PLA Southern Theater Command throws jamming bombs to make smoke screen to mask the movement during a maritime training exercise in waters of the South China Sea on August 14, 2019. Photo:eng.chinamil.com.cn