While this approach is not without merit, it can be difficult to accurately reproduce the asynchronous processing of user interface code.

虽然这种方法不是没有好处，但是要精确的复写出与用户界面异步交互的代码却很难。

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Widespread adoption of the new approach may, however, be difficult.

而要想广泛采用新疗法可能是困难的。

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The work of reflecting and revealing the uniqueness of each element in a particular circumstance can be a poignant and powerful, although difficult, approach to designing and constructing buildings.

这种反映和揭示每种元素独一无二的特性的工作虽然困难，但是却刺激而有力量，近似于设计构思建筑物。

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Mr McCluskey said he feared David Cameron could be elected on a message of "stick with us in difficult times", suggesting this was the successful approach used by President Obama last year.

BBC: Labour can't win on austerity agenda, says union boss

In this fashion, the president has a chance to present Senators Biden and Levin with a fait accompli that will be much more difficult to oppose, let alone undo, than would be the sort of "business-as-usual" approach driven by budget timelines and processes.

CENTERFORSECURITYPOLICY: Center For Security Policy

Every tumor has five to ten flawed genes driving its growth, and researchers may have to target several simultaneously with cocktails of drugs, the approach that worked against AIDS. But finding such cocktails will be slow and difficult because regulators frown on testing two experimental drugs together, and corporate rivals rarely share drugs.

FORBES: Cover Story