这种药物仅供外用，不应内服。

This medicine is for external use only and should not be taken ___internally.

我正在内网上创建一个页面，以便在公司内部共享信息。

I am creating a page on the intranet to share information about the company ___internally.

政府决定在内部处理这个问题，以维护主权。

The government decided to handle the issue ___internally to maintain sovereignty.