12 sentences

1. 让我们从三角形开始！

   ràng wǒ​men cóng sān​jiǎo​xíng kāi​shǐ!

   Let’s start with a triangle!

   Source: CCMatrix

2. 三角形的中间为空。

   sān​jiǎo​xíng de zhōng​jiān wéi kōng.

   The center of the triangle is empty.

   Source: CCMatrix

3. 改变三角形的颜色。

   gǎi​biàn sān​jiǎo​xíng de yán​sè.

   Change the color of the triangle.

   Source: CCMatrix

4. 三角形头的蛇一定有毒？

   sān​jiǎo​xíng tóu de shé yī​dìng yǒu dú?

   Are snakes with triangular heads always poisonous?

   Source: CCMatrix

5. 这是三角形吧？

   zhè shì sān​jiǎo​xíng ba?

   This is a triangle, right?

   Source: OpenSubtitles

6. 所有的三角形标志是红色的。

   suǒ​yǒu de sān​jiǎo​xíng biāo​zhì shì hóng​sè de.

   All triangular signs are red.

   Source: CCMatrix

7. 所以，一个三角形不可能有两个钝角。

   suǒ​yǐ, yī​ge sān​jiǎo​xíng bù​kě​néng yǒu liǎng​ge dùn​jiǎo.

   Therefore, a triangle can’t have two obtuse angles.

   Source: CCMatrix

8. 下一步，画一个连接两个标记的三角形。

   xià​yī​bù, huà yī​ge lián​jiē liǎng​ge biāo​jì de sān​jiǎo​xíng.

   Next, draw a triangle that connects the two marks.

   Source: CCMatrix

9. 画一条对角线，把正方形分成两个三角形。

   huà yī tiáo duì​jiǎo​xiàn, bǎ zhèng​fāng​xíng fēn​chéng liǎng ge sān​jiǎo​xíng.

   Draw a diagonal line to divide the square into two triangles.

   Source: UM-Corpus: News

10. 如果你没看到此选项，按下右上角的三角形。

    rú​guǒ nǐ méi kàn dào cǐ xuǎn​xiàng, àn xià yòu​shàng jiǎo de sān​jiǎo​xíng.

    If you don't see this option, click the triangle in the top-right corner.

    Source: CCMatrix

11. 当第三个人进来时，你们会不知不觉地形成一个三角形。

    dāng dì sān ge rén jìn lai shí, nǐ​men huì bù​zhī​bù​jué de xíng chéng yī​ge sān​jiǎo​xíng.

    When a third person enters, you will unconsciously form a triangle.

    Source: CCMatrix

12. 把这些三角形组合起来，把他们一个放在另一个的下面，形成一个金字塔。

    bǎ zhè​xiē sān​jiǎo​xíng zǔ​hé qǐ lai, bǎ tā​men yī​ge fàng zài lìng yī​ge de xià​mian, xíng​chéng yī​ge jīn​zì​tǎ.

    Combine the triangles, placing them one beneath the other, forming a pyramid.

    Source: CCMatrix