Billy is humming loudly

Jennifer: Shut up...Billy...BILLY!
Billy: [Takes off his earphones] What!
Jennifer: Wow! What's that?
Billy: It's my new radio earphone.
Jennifer: It's so small that I didn't notice it.
Billy: What were you screaming at me for?

hum (v.) 　
嗡嗡叫

earphone (n.) 　
耳塞式耳机。「头戴式耳机」是headphones。一副耳机是说成a pair of earphones/a pair of headphones

notice (v.) 　
注意到
A: Didn't Sam seem a little strange today?
山姆今天看起来是不是怪怪的？
B: I didn't notice.
我没注意到。

scream (v.) 　
尖叫
A: Do you want to see a horror movie with me?
你要跟我去看恐怖片吗？
B: Only if you promise not to scream!
除非你保证不会尖叫！

把广播戴在耳边－耳机收音机

比利在哼啊哼的

珍妮花：闭嘴……比利……比利！ 比 利：（脱掉了耳机）什么啦！
珍妮花：哇！那是啥啊？
比 利：这是我新的耳机收音机。
珍妮花：这么小一个，我都没注意到。
比 利：你刚才对着我喊什么啊？