"Discarded cigarette butt" or simply "cigarette butt" is a common term for a cigarette that has been smoked down to the filter and then thrown away. The term "cigarette butt" refers to the small, discarded remains of a cigarette, which consists of the filter and a small amount of tobacco.

The term "cigarette butt" is derived from the fact that the filter of a cigarette is made of a type of plastic called cellulose acetate, which is a type of cellulose that has been acetylated. Cellulose acetate is a synthetic fiber that is used to make a variety of products, including filters for cigarettes, film, and textiles.

Here are some example sentences using the term "cigarette butt":

"I saw someone throw a cigarette butt out the window of their car as they were driving down the highway."
"The streets were pttered with cigarette butts, and it was clear that people had been smoking in the area."
"I always make sure to properly dispose of my cigarette butt so that it doesn't end up on the ground or in the water."

中文翻译:

"丢弃的烟头"或简单地称作"烟头"是指已经抽到过滤器处并被扔掉的香烟的常用术语。"烟头"这个词指的是香烟的小型废弃物，由过滤器和少量烟草组成。

"烟头"一词源于香烟的过滤器由一种叫做纤维素乙酸酯的塑料制成，这是一种经乙酰化的纤维素。纤维素乙酸酯是一种合成纤维，用于制造各种产品，包括香烟的过滤器、膜和纺织品。

以下是使用"烟头"这个术语的一些例句:

"我看到有人开车时从车窗扔出了一个烟头。"
"街道上到处都是烟头，很明显有人在那里抽烟。"
"我总是确保正确处理我的烟头，这样它就不会掉在地上