2 sentences

1. 这根圆柱体的直径正好是十厘米。

   zhè gēn yuán​zhù​tǐ de zhí jìng zhèng​hǎo shì shí lí​mǐ.

   The diameter of this cylinder is exactly ten centimeters.

   Source: Dong Chinese Dictionary

2. 球体和圆柱体都是常见的几何形状。

   qiú tǐ hé yuán​zhù​tǐ dōu shì cháng​jiàn de jǐ​hé xíng​zhuàng.

   Spheres and cylinders are common geometric shapes.

   Source: Dong Chinese Dictionary