Helpfulness
n. 有益；有助
✅ 同义词
📖 牛津释义
helpfulness
n [U].
🗣️ 情景例句
A man next to me was smoking,and smoke really bothers me.
我旁边的那个人抽烟，我受不了。
You'll get hurt, if you don't watch out.
你不注意的话，就会受伤。
No! You don't understand! Not before or after meals--instead of them.
“不是，你没听懂！不是饭前或饭后吃--而是代替三餐饭。”