spell out
US /spel aʊt/
UK /spel aʊt/

1.
2.
阐明, 详细说明
to explain something clearly and in detail
:
•
The instructions spell out exactly what you need to do.
说明书详细阐明了你需要做什么。
•
The report spells out the risks involved in the project.
报告阐明了该项目所涉及的风险。