Although land has long been the main source for our food supply, it is not the only one.
虽然土地一直是解决食品供给的主要资源，但是土地不是提供食物的惟一资源。
Although land has long been the main source for our food supply, it is not the only one.
诚然土地始终是解决食物供给的主要资源，然而土地不是提供食物的惟一资源。
The Kuilei Lake is the main drinking water supply source of the Kunshan city.
傀儡湖是昆山市最主要的饮用水源。
The Kuilei Lake is the main drinking water supply source of the Kunshan city.
傀儡湖是昆山市最主要的饮用水源。
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