The walls are too weak to hold up the roof.

这些墙太不结实，支撑不了房顶。

youdao

The surrounding rock of roadway is a compound structure consisted of roof, floor and sides. The sides of extraction opening are the weak coal mass, which affect the stability of floor directly.

巷道围岩是由顶板、底板、两帮组成的复合结构体，回采巷道两帮为软弱煤体，直接影响到底板的稳定性。

youdao

Up a dark, winding staircase lies a shabby room, lit only by a small window set into the sloping roof which throws a weak square of daylight onto the bare wooden floor beneath.

在曲折幽暗的楼梯尽头有间破败的顶楼小屋，屋内只有嵌在斜顶上的一扇小窗在空荡荡的木地板上投下淡淡的一方阳光。

youdao

The satellite signals are just too weak to penetrate anything much thicker than the metal roof of your car.

FORBES: Smartphone Location Tools Are Great ... Until You Get to the Front Door