That’s the conclusion of a recently released study, which analysed 259 bottles from 11 brands sold in nine countries, revealing an average of 325 plastic particles per litre of water.
2019年12月四级真题（第二套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
N-COUNT
升（米制容量单位，等于1.76英国品脱或2.11美国品脱）
A litre is a metric unit of volume that is a thousand cubic centimetres. It is equal to 1.76 British pints or 2.11 American pints.
1. a metric unit of capacity equal to the volume of 1 kilogram of pure water at 4 degrees centigrade and 760 mm of mercury (or approximately 1.76 pints)