from front view, delete bottom extruded objects (fig 11), we don't need them anymore.
next, from side view, select all of these objects (fig 12), then duplicate them.

回到前視窗 , 將下面的曲面刪除掉 (fig 11), 我們不需要它 .
切換到側視窗 , 選擇所有的物體 (fig 12), 復制它們 .

fig 11



fig 12

then move these duplicated objects to about 1.5 of y axis (fig 13), and delete bottom extruded objects (fig 14)

將復制出來的物體在 y 軸上移動 1.5 的距離 (fig 13), 然后刪除掉下面的物體 (fig 14)

fig 13



fig 14

select back all of duplicated objects, then put them back to 0 of y axis (fig 15)

選擇所有復制出來的物體，將其在 y 軸上移回原位，即回歸 0(fig 15).

fig 15

the reason i copied and deleted the original object is i don't want to have any trim information anymore (it could slow down our modeling times).

我復制出新的物體并將原物體刪除掉的原因是因為我不想在關于 trim 的歷史記錄在物體上 ( 這樣做可以加速我們的時間 ).

next, with new duplicated of object still selected, go to edit duplicate > option box , and apply these duplicate settings (fig 16), hit duplicate, then you will have these duplicated rotation objects (fig 17)

接下來 , 將所有物體選擇，復制它們，復制的屬性如 (fig 16), 我們可得到如 (fig 17) 所示的物體 .

fig 16



fig 17