One reason is that Serbia's EU accession path has slowed.

其中的一个原因是塞尔维亚加入欧盟的进程减慢了。

youdao

As with other Balkan countries, a negative opinion from the Hague may delay or block EU accession.

对于巴尔干半岛的其他国家来说，来自海牙任何一个否定意见都有可能使得他们加入欧盟的进程延误或停滞。

youdao

For much of 2009 Croatia's EU accession talks were blocked by a trivial border dispute with Slovenia.

2009年克罗地亚加入欧盟的谈判，大部分都耗在琐碎的于斯洛文尼亚的边界问题上。

youdao

"But it is an important election in the sense that they need to be free,fair and non violent in order for Macedonia to qualify for certain EU accession membership qualifications."

VOA: standard.2009.03.22

Turkey,which hoped to join the European Union, threatened in January to block Nabucco, citing a lack of progress in its talks on EU accession, but on Thursday it voiced full support to the project.

VOA: standard.2009.05.08

The report gave no entry date for Croatia, but reports say the former Yugoslav state could become the EU's 28th member in 2012 after ratification of its accession treaty.

VOA: standard.2009.10.15

Turkey began EU accession negotiations in 2005, but the process has been extremely slow.

BBC: Turkey hits back at EU criticism over membership bid

However, it signed an EU accession treaty in April 2005 and joined in January 2007.

BBC: Bulgaria profile

The country's refusal to recognise Kosovo was one of the key barriers to any prospects of EU accession.

BBC: MEPs back EU-Serbia agreement