Hundreds of dozen kangmazi in Russia

This is folk slang. More than a dozen pockmarked people in Russia are folk slang, which means that it is easy to beat pockmarked people with strength. Although the phrase "hundreds of pockmarked people in Russia" is slang, it also reflects the backwardness of China's military and science and technology at that time, as well as the invasion and oppression of China by foreign powers.