Military presence and its impact on Japanese residents have been a thorny issue over the years.

多年来，军事存在及其对日本居民的影响一直是一个棘手的问题。

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Dual citizenship is a thorny issue.

双重国籍向来是个棘手问题。

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Then there is the thorny issue of privacy.

还有令人伤脑筋的隐私问题。

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On the thorny subject of Jewish settlements, Secretary of State Hillary Clinton has called for both sides to deal with the issue in negotiations.

VOA: standard.2009.11.16

Another thorny issue is the UK's annual rebate, which some of its EU partners want scrapped.

BBC: Gloom as EU budget talks resume in Brussels

Another thorny issue would be trying to raise money for common deposit-insurance and bank-resolution funds.

ECONOMIST: The euro crisis

That mega-deal will have to contend with the thorny issue of who gets control.

CNN: Here's to the New No. 1