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
-
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.
-
-
On the top level of the site collection, on the Site Actions menu, click Site Settings.
-
On the Site Settings page, in the Site Collection Administration section, click Site collection features.
-
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.