lifeblood

n.

命脉；命根子；生命线；血液

1. Trade is the lifeblood of our country.
   贸易是我国的命脉。
2. Tourism is the area's lifeblood.
   旅游业是这一地区的命脉。
3. Teachers are the lifeblood of a school.
   老师是学校的灵魂！
4. The girl is the lifeblood of her mother.
   这女孩子是她母亲的命根子。

Lifeblood:Oil, Freedom, and the Forces of Capital
Lifeblood: oil, freedom, and the forces of capital
Finance: Economic Lifeblood or Toxin?
Finance - Economic Lifeblood or Toxin?
Starving tumors of their lifeblood.
QUALITY INFORMATION: THE LIFEBLOOD OF OUR MARKETS
THE LIFEBLOOD OF BIOTECHNOLOGY: UNIVERSITY–INDUSTRY TECHNOLOGY TRANSFER
Beyond strategic planning to organization learning: Lifeblood of the individualized corporation
Heart of Our Island Has Gone; GILL SWAIN on the Tiny Isle of Iona Which Has Lost the Lifeblood of Its Community
Enhancing the security of supervisory control and data acquisition (SCADA) systems: the lifeblood of modern energy infrastructures