The transition to a multi-party democracy is proving to be difficult. [+ to]

事实证明，向多党民主制的转型非常艰难。

...a period of transition.

过渡时期

Most of the discussion was on what needed to be done now as we transitioned from the security issues to the challenging economic issues. [VERB + from/to]

随着我们由安全议题转向具有挑战性的经济议题，讨论最多的就是目前需要做些什么。

There was a significant decline in the size of the business as the company transitioned to an intellectual property company. [VERB + to]

随着公司向知识产权公司转型，其业务规模显著下降。