...a rubber ball.是什么意思？

...a rubber ball.

橡胶球

rubber

n. 橡胶，橡皮，决胜局，避孕套；adj. 橡胶制成的；vt. 涂橡胶于，用橡胶制造；vi. 扭转脖子看，好奇地引颈而望；

例句
Seven people were wounded when soldiers fired rubber bullets to disperse crowds...
士兵发射橡皮子弹驱散人群时有7个人受了伤。

ball

n. 球，棒球（投手投出的）坏球，拇指球，舞会；vt. 做成球状，使成团块，（指男性）和（女性）交媾（美式英语）；vi. 呈球形，成团块，[美国俚语、口语]狂欢作乐，消遣，尽情作乐，尽情地玩；

例句
The ball hit him in the most sensitive part of his anatomy.
球击中了他身上最敏感的部位。