栋梁之材的英文：
[Literal Meaning]
ridgepole/beam/aux./wood
Wood can serve as the ridgepole and beam of a house

[解释]
能担当国家重任的人才

[Explanation]
A person of tremendous ability and strength who can be the mainstay of the nation.

[例子]
从国外留学归来的学生们在若干年后都成了国家的栋梁之材。

[Example]
Students from overseas became the state's mainstay who are of tremendous ability and strength a few years later.

You've been a great asset to our department.
你曾是我们部门的栋梁之材