在引导程序中，如何获得两个不同维度的行

I'm using Bootstrap 3. I have two rows. The first row has 4x3 columns. The second row has one column of 3 and one column of 9. The column of 9 has twice the height of all the other columns. I would like a column added beneath the column of 3 on the second row. I have made an image to explain it.I'm using Bootstrap 3. I have two rows. The fir