对啊，就是bell,就这么简单。
因为如果你在那样情景下跟对方说bell，对方一定知道你说的上课/下课的铃声。
请特别注意class ring是指一种在美国，很多学生毕业后作为纪念而戴的戒指。
A class ring (also known as a graduate, senior ring, or grad ring) is a ring worn by students and alumni in the United States to commemorate their graduation, generally for a high school, college, or university.
就是，bell
eg:I wait for the bell.我等待（下课）铃声.
the finishing school bell /the dismissing bell
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