乱丢垃圾
littering — present participle of litter
先理解核心含义，再看它在真实句子里的用法。
乱丢垃圾
To drop or throw trash improperly, especially in public places.
People often litter in public places despite the fines.
人们经常在公共场所乱扔垃圾，尽管有罚款。
随意丢弃垃圾而不正确处理(如在公共场所而非垃圾桶中丢弃)
To drop or throw trash without properly disposing of it (as discarding in public areas rather than trash receptacles).
随意散布
To scatter carelessly about.
用散落的物品布满(某地)
To strew (a place) with scattered articles.
像动物一样分娩
To give birth to, in the manner of animals.
litter
Base
原形
litters
3rd person
第三人称单数
littering
-ing
现在分词
littered
Past
过去式
littered
Past participle
过去分词
People often litter in public places.
人们经常在公共场所乱丢垃圾。
He littered the park yesterday.
他昨天在公园里乱丢垃圾。
She has littered the street with papers.
她已经在街上扔满了纸屑。
规则动词
Please don't litter the park with your empty bottles.
请不要把空瓶子乱扔在公园里。
The dog littered six puppies last night.
这只狗昨晚一窝生了六只小狗。