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。
TED-Ed（视频版）
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。
PTE_WDF
808. Atoms are the central building blocks of matter.
原子是物质的主要组成部分。
英语百科
Central Block
Central Bloc (Portuguese:Bloco Central) is the name given in Portugal to the grand coalition the Socialist Party and the Social Democratic Party which ruled from 1983 to 1985, and to any potential coalition between those two parties.