There are two basic problems with the approach sketched above.
上面勾画的方法有两个基本问题。
Which would certainly be shorter, but two basic problems arise from this?
这显然更加简短,但它带来了两个基本问题。
Two basic problems in time series modelling are the selection of the type of model and the test of suitability of the model.
模型类型选择和模型适用性检验是时序建模的两个基本问题。
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