You can ask for a chemical analysis of your tap water.
你可以要求给你的自来水做化学分析。
《牛津词典》
2
In developed countries such as the United States and some countries in Europe, laws about safe water are often stricter fortap water than for bottled water.
在发达国家如美国和一些欧洲国家，关于安全用水的法律通常对自来水比对瓶装水更严格。
3
We already know that Justin Bieber and a song from Rent are on tapfor Glee this season.