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随意, ずいい, ずい
1. voluntary, optional, free, elective
自愿的、可选的、自由的、选择的
する, 為る
1. to do, to carry out, to perform
2. to cause to become, to make (into), to turn (into)
3. to serve as, to act as, to work as
4. to wear (clothes, a facial expression, etc.)
5. to judge as being, to view as being, to think of as, to treat as, to use...
做,作,干,执行