我买了一支钢笔，这支钢笔的颜色是红蓝相间的。

I bought a pen. The pen is blue and red.

youdao

在准备庆祝活动时，桌子上放着一张草席，还有一个蜡烛架，上面有七支蜡烛——一支黑的，三支红的，还有三支绿的。

In preparation for the celebration, a straw mat is placed on the table, along with a candle holder with seven candles, one black, three red, and three green.

youdao

他有两支钢笔，一支是红的，另一支是黑的。

He has two pens. One is a red; the other is black.

youdao