This kind of humour is infantile and boring.

这种幽默既幼稚又无聊。

She had to entertain some boring local bigwigs.

她不得不款待当地一些无聊的大人物。

As usual, I got landed with all the boring jobs.

所有枯燥乏味的工作都照例落在了我的头上。

The movie is so boring.

这个电影真乏味（无聊）。

I don't like his boring lecture.

我不喜欢他无聊的讲座。

这些句子简单易懂，适合七年级学生使用。希望这些例子对你有所帮助!