major coverage的意思|示意

The or mapping is a major layer that needs exhaustive test coverage.

OR映射是一个需要穷举测试覆盖的主要层。

Unit testing isn't the only scenario where code coverage tools are useful, but it's certainly a major use case.

单元测试并不是惟一用得着代码覆盖工具的地方，但是代码覆盖工具主要还是用在这里。

Based on the reference about domestic heritage tourism, this article summarized the research progress and major coverage about it, and discussed the question we should further study.

本文通过对相关文献的查阅和整理，对国内遗产旅游的研究进展及主要内容进行了总结，在此基础上探讨了我国遗产旅游应进一步研究的问题。