在此，Back按钮应该删除输入到清单8中定义的文本字段中的上一个字符。

In this case, the Back button should remove the last character entered into the text field defined in Listing 8.

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一个flit需要的字段包括它的版本，vid；与该flit关联的节点id, nid；以及flit message本身，定义为一个140个字符的字段。

The fields required for a flit are its version, vid; the node id associated with the flit, nid; and the flit message itself, which is defined as a 140-character text field.

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当您做出选择的时候，选择那些定义为简短字符串或者数字的字段。

When making your selections, choose those fields that are defined as short strings or numeric fields.

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