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Speaking of the reason for the decrease in the volume of trade between China and Russia so far this year , Zemin Jiang said that " We have noticed that compared to the same period last year , there is a drop in the volume of trade between the two countries , China and Russia , in the first half of this year .
 China, Russia, this year, Zemin Jiang, the same period last year, two, China, Russia, the first half of this year
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 China, Russia, this year, Zemin Jiang, the same period last year, two, China, Russia, the first half of this year