6 sentences

1. 圆珠笔是怎样发明的？

   yuán​zhū​bǐ shì zěn​yàng fā​míng de?

   How was the ball-point pen invented?

   Source: AI Challenger 2017

2. 这些圆珠笔是他们的。

   zhè​xiē yuán​zhū​bǐ shì tā​men de.

   These ball-point pens are theirs.

   Source: AI Challenger 2017

3. 她说她需要一枝圆珠笔。

   tā shuō tā xū​yào yī zhī yuán​zhū​bǐ.

   She said that she needed a ballpoint pen.

   Source: AI Challenger 2017

4. 您有圆珠笔吗？

   nín yǒu yuán​zhū​bǐ ma?

   Do you have a ballpoint pen?

   Source: Tatoeba

5. 圆珠笔的发明使书写轻松了许多。

   yuán​zhū​bǐ de fā​míng shǐ shū​xiě qīng​sōng le xǔ​duō.

   The invention of the ballpoint pen made writing a lot easier.

   Source: CCMatrix

6. 除此四种以外，还有六色、八色，甚至还有十二色的圆珠笔。

   chú cǐ sì zhǒng yǐ​wài, hái​yǒu liù sè, bā sè, shèn​zhì hái​yǒu shí'èr sè de yuán​zhū​bǐ.

   In addition to these four, there are six-color, eight-color, and even twelve-color ballpoint pens.

   Source: CCMatrix