The bedrooms in this wing are on the ground floor, the sitting-rooms being in the central block of the buildings.

这一侧的耳房的卧室在一楼，起居室位于房子的中间部位。

Solving for x, x must be 14, making the central block 21.

求解 x，x 必须为 14，使得中心块为 21。

808. Atoms are the central building blocks of matter.

原子是物质的主要组成部分。