土地红线 red line
To ensure grain security, China set a "red line" to guarantee its cultivated land never shrinks to less than 1.8 billion mu (120 million hectares).
为保证粮食安全，中国制定了土地红线，确保其可耕地数量不低于18亿亩（1.2亿公顷）。
We will make sure that China’s cultivated land area does not fall below the red line of 120 million hectares.
我们要坚守耕地红线。
