Performing direct experiments on researcher misconduct is costly and difficult, but the potential effects of proposed reforms can still be evaluated by using economic theory.
数据库管理很重要而且很难--我们最好不要选择自己做。
Database management is important and hard-and we would rather not be doing it ourselves.
然而,大多数是不方便,而且很难使用,因为一个贫穷和复杂的UI。
However, most are inconvenient and difficult to use because of poor and complicated UI.
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