1. 名詞
   濃度, 濃縮
   concentration of ...(物質)/
   a concentration of ...(物質):
   ...的濃度
   /以上可為可數與不可數名詞/
   可數名詞:
   集中, 集結
   a concentration of ...(人事物):
   ...的集中
   ...的集結
   

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

例句

1. It took lots of focusing and concentration .
2. This has been affecting their concentration .
3. Now take your concentration down to your feet.
4. Dissenters are still sent to concentration camps.
5. Figuring chlorine concentration is based on weight.
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