First give a general outline, then specialize.

先讲概要，再逐条详述。

youdao

The book aims at giving a general outline of the subject.

这本书旨在对这门学科作概要说明。

youdao

The book (was) aimed at giving a general outline of this subject.

这本书的目的是要对这个问题作个大概描述。

youdao

Beyond that, however, they have pressed to remove any mention in the new outline of a general change in principle on arms exports.

ECONOMIST: Japan

Then, with a few other flowers, I sketched the general outline and shape before placing the rest of the stems into the composition.

WSJ: Sweet Spring | Creating the Perfect Spring Floral Arrangement

The Senate leadership is looking to McCain to take the lead on tobacco legislation, and McCain has been consulting with the White House, state attorneys general and members of the health community to hammer out a rough outline of a bill.

CNN: McCain Prepares To Unveil Tobacco Settlement Proposal