Exposed iron will gradually rust away to powder.
放在露天的铁会逐渐锈成粉末。
If you don't paint those metal trimmings on your Windows, they will soon rust away to nothing.
窗户上那些金属花边如不上油漆，很快就会生锈烂掉。
If you don't paint those metal trimmings on your Windows, they will soon rust away to nothing.
窗上的那些金属花边如果不上油漆，很快就会长锈烂掉的。
If you don't paint those metal trimmings on your Windows, they will soon rust away to nothing.
窗上的那些金属花边如果不上油漆，很快就会长锈烂掉的。
应用推荐