1、littering是乱丢垃圾的意思。
2、例句：
（1）He disliked the litter of human dwellings.他不喜欢住处搞得乱七八糟。
（2）Any person found leaving litter will be prosecuted.禁扔垃圾，违者必究。
（3）The litter is gently deposited on the floor.担架轻放在地上。
（4）There was litter strewn all over the pavement.人行道上到处都是扔的垃圾。