1
a piece of wastepaper
wastepaper 常作不可数名词，可用 a piece of 表示数量。
He crumpled up a piece of wastepaper and dropped it into the bin.
他把一张废纸揉成一团，扔进了垃圾桶。
废纸
先理解核心含义，再看它在真实句子里的用法。
废纸
paper that has been discarded as no longer useful
He crumpled up a piece of wastepaper and dropped it into the bin.
他把一张废纸揉成一团，扔进了垃圾桶。
废弃的纸张。
Unwanted paper that has been discarded.
Please put the wastepaper in the blue recycling bin.
请把废纸放进蓝色回收箱。
She tore the wastepaper into small pieces before throwing it away.
她先把废纸撕成小块再扔掉。
The janitor gathered all the wastepapers from the classrooms.
清洁工把教室里的所有废纸收了起来。
wastepaper 常作不可数名词，可用 a piece of 表示数量。
He crumpled up a piece of wastepaper and dropped it into the bin.
他把一张废纸揉成一团，扔进了垃圾桶。
This recycled paper is made from wastepaper.
这种再生纸是用废纸制成的。
Not this
Don't wastepaper; please use both sides of the paper.
Use this
Don't waste paper; please use both sides of the paper.
wastepaper 是名词“废纸”，不是动词；表示“浪费纸”要用动词短语 waste paper（waste 加宾语 paper），中间需要空格。
Not this
Please throw the used paper into the wastepaper.
Use this
Please throw the used paper into the wastepaper basket.
wastepaper 指“废纸”这种材料，不指装废纸的容器；“废纸篓”应说 wastepaper basket，不能省略 basket。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
废纸篓
He tossed the empty envelope into the wastepaper basket.
他把空信封扔进了废纸篓。
回收废纸
The school encourages students to recycle wastepaper.
学校鼓励学生回收废纸。
一堆废纸
I found a pile of wastepaper on the desk.
我在书桌上发现了一堆废纸。
揉皱的废纸
The bin was full of crumpled wastepaper.
废纸篓里满是揉皱的废纸。
卖废纸
They sell wastepaper to the recycling center to earn some money.
他们把废纸卖给回收站来赚点钱。
废纸篓是作家最好的朋友。（常被引用来强调写作中删改和舍弃的重要性。）
He crumpled the letter and tossed it into the wastepaper basket.
他把信揉成一团，扔进了废纸篓。
Use wastepaper naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象“wastepaper”=浪费（waste）掉的纸（paper），揉成一团扔进废纸篓的就是它。
语域：neutral 常见场景：office、home、recycling 该词通常用于中性语境，指废弃的纸张，多用于办公室、家庭或回收场景；正式和非正式场合都较常见。
wastepaper 通常作不可数名词，指废纸；复数 wastepapers 用于指废纸的具体实例或种类。
Dictionary facts from ECDICT, WIKTIONARY.