- 惆怅
- melancholy
- 惆怅
- disconsolate
- 惆怅
- down-hearted
- 臭虫
- bedbug
- 抽样
- sample
- 抽样
- sampling
- 抽样调查
- sample survey
- 抽样调查
- sampling
- 抽样分析
- sampling analysis
- 随机抽样
- random sampling
- 臭氧
- ozone
- 臭氧层
- ozone layer
- 臭氧洞
- ozone hole
- 重唱
- ensemble
- 二重唱
- duet
- 三重唱
- trio
- 四重唱
- quartet