I could have kept him in my back yard, but to pen up a dog like that is a sin.

我本可以把它留在后院里，但圈养这样的一条狗是件罪过。

A point that does not block the flow may leave drops of ink, as you pick the pen up and put it down again.

当你拿起钢笔再次放下时，不阻止流动的小球可能会留下墨水滴。

Unit 1 Section B One summer day my father sent me to buy some wire and fencing to put around our barn to pen up the bull.

夏日的一天，父亲让我去买些铁丝网和栅栏，用来围畜棚，把牛圈起来。