Others have pointed out limitations with the bracelets, including that they are not able to tell whether a student was responding to their teacher or something a friend whispers in their ear.

还有些人指出了这种手镯的局限性，比如通过手镯无法得知学生的反馈是针对老师的授课内容，还是好友的窃窃私语。

youdao

"Griphook," he whispered into the goblin's pointed ear, "you must tell them that sword's a fake, they mustn't know it's the real one, Griphook, please -".

“拉环，”他对着妖精的尖耳朵低语道，“你必须说宝剑是假的，千万不能让他们知道是真的，拉环，求你了——”。

youdao