I bought six pens which cost me thirty yuan. When I took them back home, I found they were second hand.

我买了六只钢笔，（这六只钢笔）一共三十元。（当我）拿回家一看，（发现钢笔）都是用过的。

youdao

Another popular event involves having the dog split six sheep into two groups of three and conducting each group in turn to small pens through a defined course by heading dogs.

另外一种受欢迎的赛事要求由两只牧羊犬参赛。比赛要求犬只将六只羊分成两组，每组各三只，并且轮流两群羊进行控制，使羊群排列整齐地在领头犬只的带领下通过规定的路线。

youdao

While a teacher at an English state secondary recalled "six boys refusing to work, throwing glue, pens, fighting and throwing books".

BBC: Poor parenting 'fuels rise in violent behaviour'

If you asked for a poem that featured fountain pens he would find not one, but six.

ECONOMIST: John Gross | The

Ninety-six Liverpool supporters died on 15 April 1989 when a crush within two pens at the Leppings Lane terrace of Sheffield Wednesday's stadium occurred at the beginning of a FA Cup semi-final.

BBC: Government to pay Hillsborough families' inquests costs