Arthur is a good fielder but he's got a glass arm.

亚瑟是个好外野手，却有一只容易酸痛的手臂。

youdao

He balanced the glass precariously on the arm of his chair.

他把杯子放在椅子的扶手上，随时可能摔下。

《牛津词典》

Through the glass of the numerous Windows you can see the arm samples of different times, German and other foreign arms.

透过这些玻璃罩，我们可以看到各个时期，各个国家(比如德国，等等)的武器。

youdao

Behind a tinted glass panel 18-carat gold powder, laid down by a robot arm, sparkles as a laser fuses the metal into complex three-dimensional shapes, layer by layer.

BBC: How tech is transforming jewellery

So I squeezed into the crumpled passenger area, sat on the shattered glass, and tried to take the pulse from his passenger-side arm (nothing) and his neck (nothing).

NPR: 'Operation Homecoming': The Writings of War