RUST unpainted metal tools were covered with rust.是什么意思？

RUST unpainted metal tools were covered with rust.

未上漆的金属工具布满了锈.

rust

n. 铁锈，锈病，锈菌，荒废，停滞，锈，锈色；vt.& vi. （使）生锈，[植]害锈病，变钝，荒废；

例句
...turquoise woodwork with accent colours of rust and ochre.
主色调为深褐色和赭色的青绿色木制品

Unpainted

adj. 无复层的，未上漆的；

例句
If bricks or wooden walls are treated but unpainted they look beautiful.
墙面经过打磨(刮大白)但不喷色漆看起来会很漂亮.

metal

n. 金属，金属元素，成色，金色；vt. 以金属覆盖；

例句
The profits rise was achieved against a backdrop of falling metal prices.
在金属价格下跌的背景下，利润提高了。

tools

n. 工具( tool的名词复数 )，（有助于做工或完成某事的）用具，受人利用的人；

例句
...an opportunity to purchase a set of tools at very advantageous prices.
以非常优惠的价格购买一套工具的机会

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

covered

adj. 大量的，有遮盖物的，（尤指）有顶的；v. 覆盖( cover的过去式和过去分词)，掩护，包括；

例句
I covered the scroll in sealing wax, and affixed a red ribbon.
我用封蜡将卷轴封好，并系上一根红丝带。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。