这是一个极其困难的问题。
当小鱼面临极其困难的问题时，比如说，突然遭到几个捕食者的袭击，他们会立刻形成鱼群。
When small fish face an extremely difficult problem-an attack, say, from several predators at once-they deal with it by forming a school.
正如Benjamin所指出的，问题是对各式各样的MIME类型的全盘采用是极其困难的，而且不能扩展。
The problem as Benjamin points out, is that getting universal adoption of various MIME types is extremely difficult and doesn't scale.
然而，场论中的强耦合问题是极其困难的。
However, in the strongly coupled field theory problem is extremely difficult.
发展性阅读困难是学龄儿童常见的学习障碍，其病源学问题极其复杂，很多行为遗传学家针对遗传和环境对阅读困难的影响进行了大量的研究。
Developmental dyslexia is very common in school children and its etiology is very complicated. Many researches have been carried out to study the genetic and environmental influence on dyslexia.
发展性阅读困难是学龄儿童常见的学习障碍，其病源学问题极其复杂，很多行为遗传学家针对遗传和环境对阅读困难的影响进行了大量的研究。
Developmental dyslexia is very common in school children and its etiology is very complicated. Many researches have been carried out to study the genetic and environmental influence on dyslexia.
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