Translation unit is a crucial and controversial problem in translation theory and practice.

翻译单位是翻译理论中一个关键问题，也是颇有争议的问题。

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Whether China's stock market is weak form efficient has always been a controversial problem.

中国股票市场是否已经达到弱式有效性一直是一个争议很大的问题。

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The issue of the jurisdiction of ICC is the most controversial problem in the Rome Convention.

国际刑事法院的管辖权问题，是罗马会议中争论最激烈的问题之一。

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Iraq's National Security Advisor, Mouwafak al-Rubaie was in Washington this week and was asked about controversial security contractor Blackwater and the problem of holding security contractors accountable for what they do in his country.

NPR: Contractors Working Overseas Subject to U.S. Law

The Japanese technique circumvents the major ethical problem that has made research using embryonic stem cells controversial.

FORBES: Magazine Article

Does the White House have any problem with federal dollars being sent to a counseling clinic that engages in the controversial therapy of trying to cure people of being gay?

WHITEHOUSE: Press Briefing