It shot forth from the central fluting of a column that supported the pediment of the bookcase.

它从支撑书架三角墙的柱子中央的凹槽中射出。

At length, as if commanded to go on again, scores of arrowy comets shot forth from the bottom of the suspended mass as if escaping from separate outlets.

终于，仿佛接到了继续前进的命令，数十颗带箭头的彗星从悬浮物的底部射出，就像从不同的出口逃脱一样。