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。

He heard far off the ululation of his putsuers .

他听见远处 追逐他的人的 喊叫声。