孩子们一看到老师走进教室，就欢快地喊起了'嗨-嗨'。

The kids cheerfully yelled '___hi-de-hi' when they saw their teacher enter the classroom.

夏令营的领队用欢快的"hi-de-hi"口号让孩子们立刻活跃起来。

The camp leader used a cheerful "___hi-de-hi" to get the kids excited immediately.