Will no longer unable to pronounce the sound, and this time the window is ululation one, it is to watch the instructor calling the laborers were issued.

就再也发不出声了，此时窗外也是泣声一片，那是指导员喊来旁观的劳改犯们发出的。

The appearance of ululation of apes together with the imagery of maple in poems is an auditory echo of seeing and this forms a double-imagery and sublimates the subjective feelings of poets.

枫树与猿声并行出现在作品中是视觉与听觉的互应，是双重意象的叠加，并以此升华了作家的主观情感。