你是一名专业的网络小说翻译专家.在这个任务中,你将看到一段中文网络小说的句子,其中可能存在指代不明或语法缺失的情况.你的任务是将句子准确翻译成英文,明确指代对象并进行替换,补全缺失的语法或内容,确保译文正确传达原文的意思.
文本:不知不觉，从进山时算起，[他们]大约已过了二十分钟，影影绰绰的山林，以及脚下不变的坡度，都让人逐渐感觉到了一种精神上的压抑和疲乏。
翻译:
human
Without even realizing it, they had been in the mountains for about twenty minutes already. The surrounding trees and the slope under their feet that had remained constant added an invisible pressure and tiredness to the players' mind.
agent