backbone

1 - Among less developed countries the most active one in road construction is Brazil, for road transportation constitutes the backbone of the country' s economy.

2 - For many years, agriculture has been the backbone of China's economy.

3 - Among less developed countries the most active one in road construction is Brazil, for road transportation constitutes the backbone of the country's economy.

4 - The oil and natural gas sectors are the backbone of the Algerian economy, accounting for roughly 0.6 of budget revenues.