她在窗前发呆了很久。

She stared blankly out the window for a long time.

他经常在课堂上发呆。

He often stares blankly in class.

我们看到他在公园里发呆。

We saw him staring blankly in the park.

孩子们有时会在课堂上发呆。

Children sometimes stare blankly in class.

她可以在听音乐时发呆好几个小时。

She can mong for hours while listening to music.

开会时不要发呆，我们需要你的意见。

Don't mong during the meeting; we need your input.

他在工作了一整天后，喜欢在电视前发呆。

He tends to mong out in front of the TV after a long day at work.

他在会议中发呆，没有听到老板说的话。

He stared blankly during the meeting and missed what the boss said.

他在课堂上发呆，没有注意听讲，被抓住了。

He was caught monging in class instead of paying attention.

当老师发现他在发呆时，男孩显得羞怯的。

The boy looked sheepish when the teacher caught him daydreaming.