concentration
n.
1630s, "action of bringing to a center," noun of action from verb concentrate, v.. Meaning "a mass so collected" is from 1670s; "continuous focus of mental activity" is from 1846.
| 词汇 | concentration |
| 词根词缀 | Online Etymology Dictionary concentration n. 1630s, "action of bringing to a center," noun of action from verb concentrate, v.. Meaning "a mass so collected" is from 1670s; "continuous focus of mental activity" is from 1846. |
| 随便看 |
|
英语词根词缀词典收录了54763条英语词根词缀词条，基本涵盖了全部常用英语词汇的词根、词缀及词根记忆法解析，是记忆英语词汇的必备工具。