Research on grain production efficiency in China's main grain producing areas from the perspective of financial support.

It can be found that the grain production efficiency in China’s main grain producing areas showed the features of uneven spatial development from 2001 to 2017, which generally showed a trend of decline from the central region to the eastern and western regions.

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The sentence "the overall food supply will be severely tested" indicates: as mentioned above, China's cultivated land supply has been insufficient and will show a decreasing trend in the future, which will directly lead to the shortage of grain supply, so the overall grain supply will be severely tested.

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