Helpfulness
n. 有益；有助
✅ 同义词
📖 牛津释义
helpfulness
n [U].
🗣️ 情景例句
Does this come with a certificate of authenticity?
这有鉴定证明吗？
I know the boy whose father is an architect.
我知道那个男孩的父亲是建筑师。
The one near the school. It sells books and things like that.
就是学校附近的那个。卖书之类的东西。