It's a sensible choice to take legal principle as the formal source of the law of our country.

法理作为我国法律的正式渊源，是基于现实的明智选择。

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Historically, there never was a formal source code management or revision control system for the Linux kernel.

历史上，从来没有出现过用于Linux内核的正式的源代码管理或修正控制系统。

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The informal source of law is a supplementary to the formal source of law, it can be used only in the position that there are no law, law interpretation and judicial interpretation.

非正式法源对于正式法源起到一定的补充性作用，只有在法律、法律解释或者司法解释没有规定的情况下才可以适用。

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Among a raft of reforms approved by parliament last month, one relegates the National Security Council, until now their formal source of power, to a largely advisory role.

ECONOMIST: Turkey's politics: All-powerful but not at ease | The

Now, the community of women in leadership roles at Get Satisfaction act as a source of formal and informal mentorship.

FORBES: More Women In Tech, More Women Mentors

Parts of Afghanistan's 1963 constitution, which was in place during the monarchy, were used to create the draft proposal, a source said, though no formal role for the king is envisioned in a new government.

CNN: Afghan factions sign power deal