zhè ge / léng tái / yǒu / liǎng gè / hù xiāng / píng xíng / dàn / dà xiǎo bù tóng de / dǐ miàn / cè miàn / dōu shì / tī xíng

这个棱台有两个互相平行但大小不同的底面，侧面都是梯形。

This frustum has two parallel bases of different sizes, and all of its side faces are trapezoids.