之后，用户可以添加更多的搜索条件，单击加号或减号按钮。

After that also user can add more search conditions by clicking on plus or minus button.

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每个更改前的减号(-)或加号(+)与行上方的文件名一致。

The minus sign (-) or plus sign (+) before each change corresponds with the file names directly above the line.

youdao

每个更改前的减号(-)或加号(+)与行上方的文件名一致。

The minus sign (-) or plus sign (+) before each change corresponds with the file names directly above the line.

youdao