With difficulty he released the mattress from the metal frame, and groped beneath it.

他费了很大劲把床垫从金属架上卸下来，然后在下面摸索一番。

Rust has eaten away at the metal frame.

这个金属框已被慢慢腐蚀了。

Metal frame sunglasses with Polarized lens.

塑框-偏光-太阳镜！

The metal frame tends to twist under pressure.

这种金属框受压后容易变形。

A modern tent has cloth walls over a metal frame.

现代帐篷都是在金属架上盖布做墙。