hard to come by;rare;seldom;rarely;one in a thousand ;

Mathematical physics is an almost impossibly difficult subject.
数学物理是一门难得超乎想象的学科。
来源:《柯林斯高阶英汉双解学习词典》Successful venture capital investment is a lot harder than it sometimes looks.
成功的风险投资有时要比它表面看起来困难得多。
来源:《柯林斯高阶英汉双解学习词典》
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