lightweights

He was the defending world lightweight champion.

他是世界轻量级冠军的卫冕者。

In certain circles he has been dismissed as a literary lightweight.

在某些圈子里，他被斥为对文学一知半解。

I need a lightweight jacket for the summer evenings.

我需要一件夏天晚上穿的薄夹克衫。

She's the author of some fairly lightweight historical novels.

她写了几部内容相当肤浅的历史小说。