Helpfulness
n. 有益；有助
✅ 同义词
📖 牛津释义
helpfulness
n [U].
🗣️ 情景例句
You are coming along well.
你进展得很好。
If I'm not mistake.
如果我没搞错的话。
and another group were disturbed for an equal period of time but when they were no exhibiting eye-movements,
另一组人也是连续几夜被叫醒，但是在眼球队没活动时被叫醒的。