n.命脉;命根子;生命线;<文>血液;
例句:
We often say that policy and tactics are the lifeblood of the Party.
我们常常说,政策和策略是党的生命.
The boy is the lifeblood of his parents.
这男孩是他父母的命根子.
Ideas are the lifeblood of any business.
思路就是生命线的任何业务.