Brian considered Sam a lightweight, a real amateur.

布赖恩认为萨姆是个无足轻重的人，是个真正的业余选手。

《柯林斯英汉双解大词典》

L is for layers.Wearing loose, lightweight clothes, one layer on top of another, is better than wearing a single heavy layer of clothing.

VOA: special.2009.12.23

When this book first came out, critics called her a lightweight.

当她出版了第一本书时评论家们说她无足轻重。

耶鲁公开课 - 1945年后的美国小说课程节选

Some Republicans dismiss Kennedy as a political lightweight, a celebrity front man for Gephardt's political strategy.

CNN: latimes.com: Talking baseball and politics with George W. Bush

Provide a lightweight device with a large screen, fast processor, connectivity, lots of memory, and a full range of applications and you have a winning product.

FORBES: The Amazon Kindle Fire May Kill The RIM Playbook

Alexander Wang bonded brushed mohair to neoprene to get a lightweight material with a soft but slightly stiff voluminous look for several looks in his eponymous fall collection.

WSJ: Polyester Is Back in Style at Alexander Wang, Talbot Runhof, Akris