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月四級真題（第二套）閱讀 Section A
柯林斯高階英漢雙解學習詞典釋義
N-COUNT
升（米制容量單位，等于1.76英國品脫或2.11美國品脫）
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)