Rust spot is the most common in all symptoms of marble.

在大理石材料产生的众多病症中，锈斑是最为常见的。

youdao

Sprinkle the powder onto the rust spot and let sit for 10 minutes before wiping away with a damp sponge.

将研碎的粉末涂在锈斑上，并且保持10分钟，然后用潮湿海绵擦净。

youdao

SEM observation showed that the surface of 1420 Al-Li alloy turn colors, and rust spot become bigger after salt corrosion.

电镜扫描观察发现，1420铝锂合金锈点直径较大，且连成片，表面明显变色。

youdao

Ohioans have long had a soft spot for heavy metal, which became more popular when the U.S. Rust Belt lost its manufacturing clout in the 1980s, scholars say.

WSJ: Heady Metal: Scholars Celebrate a Rock Genre's Cultural Bang