One one's own (idiom)

　　●If you do something on your own, you do it without any help from other people.

　　（靠自己，主動地）

　　1.I work best on my own.　　

　　2.I had to finish designing the website on my own after many of our workers were laid off.

　　Casual worker (noun)

　　●A person who has temporary, as opposed to permanent or regular, employment.

（臨時工，散工）

　　1.They employ casual workers to pick the fruit.　　

　　2.It became increasingly expensive to hire casual workers.

　　Lament (verb)

　　●To express regret or disappointment about something.（慨嘆，感慨）

　　1.She lamented the lack of shops in the town.　　

　　2.The poem opens by lamenting over the death of a young man.

　　Roam (verb)

　　●To go from place to place without purpose or direction.（漫步，四處走）

　　1.Farmers were encouraged to keep their livestock in pens rather than letting them roam freely.　　

　　2.She roamed around America for a year, working in bars and restaurants.

　　Take effect (idiom)

　　●To start to be valid; to begin to work or become effective.（生效，起作用）

　　1. Your promotion takes effect from the end of the month.　　

　　2.This piece of legislation takes effect next week.