孩子们跟着音乐节奏开心地拍手，嘴里还哼着“哒哒哒”。

The children clapped happily to the music while humming "___da-da-da".

当她想不起来名字时，就用了'哒哒哒'来代替。

When she couldn't recall the name, she just said '___da-da-da' instead.