有四个一样简单，中等，困难和挑战的难度级别。
There are four difficulty levels like Simple, Medium, Difficult and Challenge.
当前，我国中等专业教育中的数学教育遇到了前所未有的困难和挑战。
At present, the mathematics education of the secondary professional schools in our country is meeting the unprecedented difficulties and challenges.
当前，中等职业教育既面临着前所未有的大好机遇，同时也遇到了许多新的问题和困难。
At present, the secondary vocational education is facing an unprecedented opportunity, but also encountered many new problems and difficulties.
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