要求是 不要事先通读全文
看到第一个完整译群（也就是有意义的语段）就张嘴开始翻译
尽量做到全文保持一个速度 没有明显停顿的完成
Air quality in Chinese cities improved in April, according to the Ministry of Ecology and Environment.
For 339 cities monitored by the ministry, the share of good air quality days stood at 92.5 percent last month, up 3.8 percentage points year on year, ministry data showed.
The average PM2.5 density dropped by 15.2 percent year-on-year and the average density of PM10 shrank 11.3 percent year-on-year to 55 micrograms per cubic meter.
The Beijing-Tianjin-Hebei region and the neighboring area saw their share of good air quality days increase by 4.4 percentage points to 84.5 percent last month.
In the first four months, the share of good air quality days stood at 83.8 percent, down 0.9 percentage points, while the average PM2.5 density dropped by 2.4 percent to 41 micrograms per cubic meter.
Source:https://language.chinadaily.com.cn/a/202105/25/WS60acb3e2a31024ad0bac1569.html
本周素材来源于【中国日报网】
官方翻译请参考链接
答案和解析来了哦！
以下为Via老师的视译版本
供大家参考：
Air quality in Chinese cities improved in April, according to the Ministry of Ecology and Environment.
生态环境部发布消息称，中国城市的空气质量在四月有所提升。
For 339 cities monitored by the ministry, the share of good air quality days stood at 92.5 percent last month, up 3.8 percentage points year on year, ministry data showed.
在该部门监测的339个城市中，空气质量良好的天数占比为92.5%，这是上个月的情况，同比增长3.8个百分点。
The average PM2.5 density dropped by 15.2 percent year-on-year and the average density of PM10 shrank 11.3 percent year-on-year to 55 micrograms per cubic meter.
PM2.5平均浓度同比下降15.2%，PM10平均浓度同比下降11.3%，达到每立方米55微克。
The Beijing-Tianjin-Hebei region and the neighboring area saw their share of good air quality days increase by 4.4 percentage points to 84.5 percent last month.
京津冀及周边地区空气质量良好的天数占比增加4.4个百分点，在上个月达到84.5%。
In the first four months, the share of good air quality days stood at 83.8 percent, down 0.9 percentage points, while the average PM2.5 density dropped by 2.4 percent to 41 micrograms per cubic meter.
在头四个月，空气质量良好的天数占比为83.8%，下降0.9个百分点，同时PM2.5平均浓度下降2.4%，为每立方米41微克。
短小精悍呢