adj. rambunctious ; rebellious ; unruly ; uncontrollable ; ungovernable
这已经证明是个主要的而又是个难控制的水污染问题。
This has proved to be a major yet intractable part of the water pollution problem.
我相信恐惧是一种人类很难控制的情绪，尤其是对拒绝的恐惧。
I believe that fear is one of the emotions that people have a hard time handling, more specifically the fear of rejection.
而这些因素是很难控制的，以至于“对有些父母来说，想要孩子不长胖简直是难于上青天”。
These factors were so strong that "for some parents, it is very difficult to stop their child gaining weight".
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