Until now, Citigroup has taken a more AD hoc approach.

迄今为止花旗银行所采取的是一种比较特别的方式。

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The big disadvantage of this ad hoc approach is that it can be extremely slow, and it will be expensive if you do a lot of searching.

这种特别方法的 最大缺点在于速度特别慢，而且如果进行许多次搜索的话，成本很高。

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A QA team can become much more effective and efficient by replacing an AD hoc testing approach with formal, repeatable processes that include test planning, defect cause analysis, and automated tests.

QA团队通过将包含测试计划、缺陷原因分析，和自动化测试的正式、可重复的过程，替代特殊的测试方法，以变得更加有效且高效。

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This can't be another case-by-case, ad hoc approach that arbitrarily favors some companies deemed too big to fail while consigning others to bankruptcy court.

WSJ: How Obama Can Fix the Economy

Adding to the confusion was the fact that the Philippines has never before conducted an impeachment trial, so there is a distinctly ad hoc approach to procedure.

ECONOMIST: The Philippines

Here too the Americans favour a voluntary, ad hoc approach.

ECONOMIST: From bail-out to bail-in