观感的英文：
impressions
Note down one's impressions of a city
记下对一座城市的观感
But such an impression is not permanent and can be changed with a better frame
但这观感是一时的，可以重新改造。
Removal techniques must be considered based on toxicity, aesthetics, and possible long term effects on the biosphere
必须根据毒性、观感及对生物圈的长期作用考虑去除措施。
n. 印象；感想；作用；影响；效果；痕迹；压痕
lacking in impressiveness.
缺少令人难忘的特点。
It is an impressive portrait.
这是一幅鲜明的人物肖像。
impress a mark on [ upon ] a surface=impress a surface with a mark
在表面上打记号
A stamp or seal meant to be impressed.
图章用来盖戳的图章或印章
My impression is that they are satisfied with you explanation .
我的印象是,他们对你的解释很满意。