When I select a category, the different sub categories are displayed in second column.
当我选择一个类别，不同的子类别都显示在第二栏。
The second experiment is a serial experiment which consists of three sub-experiments.
第二个实验是一个系列实验，下分三个小实验。
England brought on a sub in the second half.
英国队下半场换上了一名替补队员。
England brought on a sub in the second half.
英国队下半场换上了一名替补队员。
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