创建审批工作流时，竟然发现模板里没有审批工作流的模板，查了一下，需要在网站设置里对模板进行激活才行。

To activate a workflow for a site collection

1. Verify that you have the following administrative credentials:

   • You must be a member of the site collection administrators group on the site collection that you are configuring.

2. On the top level of the site collection, on the Site Actions menu, click Site Settings.

3. On the Site Settings page, in the Site Collection Administration section, click Site collection features.

4. On the Features page, click Activate next to the workflow feature that you want to activate.

   The Status column displays “Active” to indicate that the feature is now active.