There are some questions exist in top-coal caving face like gas accumulation and high cost for treatment.
煤矿井下综放采煤工作面存在瓦斯积聚、治理费用昂贵问题。
Though the current definitions of jurisprudence in China seem to be reasonable, some questions still exist.
我国目前对法理学的定义多种多样，虽有其合理性，但也存在不少问题。
Over many years, scholars have been arguing whether there exist some kind of gender difference in the whole test or individual questions and associated mark schemes.
许多年以来，学者们对于在试卷测试或者单项测试以及评分标准中是否存在着性别差异一直都存在不同看法。
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