这提供了确凿的证据证明他犯了罪。

This provided ___solid evidence that he committed the crime.

这门戏剧课程为学生打下了坚实的表演基础。

The drama course gives students a ___solid grounding in the basic techniques of acting.

它可能对你有帮助，因为你有一个扎实的背景和大量可以在实践中使用的理论信息。

It may help you, because you have a ___solid background and plenty of theoretical information which you could use in practice.