"spitballs" in Chinese (Simplified)
纸团（用口水做的）
Definition
用嘴嚼湿后、用吸管或嘴巴射出的纸团，常作为恶作剧或玩笑在学校里出现。
Usage Notes (Chinese (Simplified))
多用于学校、非正式场合，描述孩子顽皮的行为。常用复数。不应与棒球中的“spitball”（违规投球）混淆。
Examples
The students made spitballs during class.
学生们在课堂上做了**纸团**。
Please do not throw spitballs at your classmates.
请不要向同学扔**纸团**。
He got in trouble for shooting spitballs in the hallway.
他因为在走廊里射**纸团**被批评了。
Back in school, we used to have contests to see who could launch spitballs the farthest.
上学时，我们会比赛谁能把**纸团**射得更远。
Teachers are always on the lookout for flying spitballs during boring lectures.
老师们在无聊的课程中总是警惕飞来的**纸团**。
It took ages to clean all the sticky spitballs off the ceiling after the party.
聚会后花了好长时间才把天花板上的粘性**纸团**清理干净。