concentrations 

  1. 名詞
concentration複數: 濃度, 濃縮
集中, 集結
concentrations of ...(物質):
...的濃度
concentrations of ...(人事物):
...的集中
...的集結

    同義字詞
absorption,attention,engrossment,enthrallment,immersion

例句

  1. Concentrations range from 4 to almost 100%.
  2. Need to be real careful with chlorine concentrations .
  3. Be careful with concentrations of treatment chemicals.
  4. The high dust concentrations in these piles can explode if ignited.
  5. The program offers different English taught degree concentrations .