succinctly

In other words, you need to succinctly state what your application does.

换句话说，您需要简洁地描述应用程序完成的工作。

That was partly because, even if his message bore no relation to his actions, it expressed precisely and succinctly what he should have been doing.

这一部分是因为，即使他的讯息和行为之间找不到任何联系，但他清晰、简洁地传达了本该做的事情。