难以界定
Hard to define
以上为机器翻译结果，长、整句建议使用 人工翻译 。
究竟什么可称作进攻性武器仍然难以界定。
Exactly what can be called an offensive weapon is still a grey area.
《牛津词典》
社会道德是难以界定、难以定义的。
Social morality is illusive and difficult to define.
youdao
快乐难以界定，更难以测量。
Happiness is difficult to define and even harder to measure.
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