房间的空气得到了净化。
527, purity n.纯净;纯洁;纯度
She was a woman of purity and goodness.
她是一位纯洁善良的妇女。
528, pursuit n.追赶;追求;事务
They set off at once along the lane in pursuit.
他们立即出发沿着小巷追赶。
工作; 消遣; 嗜好
Games like chess are rather intellectual pursuits.
棋类比赛是相当费脑力的娱乐。
529, qualification n.资格;限制条件
n. 合格证书
Jack has obtained a medical qualification.
杰克取得了行医资格证书。
资格, 条件
You have all qualifications to do the job.
你有资格做这份工作。
限制, 限定性条件
The contract has several qualifications for both parties.
该合同对双方都提出了几个限制性条件。
530, qualitative a.质的;定性的
adj. 定性的, 性质的; 质量的
Qualitative analysis shows that water is made up of hydrogen and oxygen.
定性分析表明水是由氢氧结合而成的。
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