“当时环境”可以翻译为“the circumstances at that time” 或者 “the environment at that moment/point in time” 。
“the circumstances at that time” 更侧重于描述当时的具体情况、条件或事态背景。
“the environment at that moment/point in time” 则更强调当时所处的自然、社会或物理环境。
根据具体语境选择合适的表达即可。