... object difficult of attainment不易达到的目的 be difficult of definition难以下定义 be difficult of explanation难以解释 ...
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Finding a universal definition of marriage, though, has proven to be difficult.
尽管要对婚姻进行定义确实困难重重。
Since we don't have a very precise machine definition of what it means to be - for a meme to be truthy, it's really difficult to tell how to best do that.
我们对此没有非常精确的机械定义--要让一条发言看起来更真实，很难说怎么做最好。
When using various skins and styles, it sometimes becomes difficult to keep track of which style definition will be used for a particular class.
在使用多种皮肤和样式时，有时很难知道某个特定的类使用的是哪个样式定义。
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