The process by which it is refined also produces a toxic "red sludge", which can cause serious pollution if it washes into streams and rivers.

铝矿冶炼过程会产生一种有毒的"红色污泥"，如果它们被冲洗进河流时会带来严重污染。

youdao

Strip mining is efficient, but scars the land and bauxite processing releases a toxic red sludge that can seep into water supplies if not adequately contained.

露天开采(strip mining)很有效率，但会给大地留下伤疤，而且加工铝土的过程会释放有毒污染物，如果没有适当的控制，这些污染物会渗入水中。

youdao

Further downhill, you've got the red sludge.

再下坡一点就可以看到赤泥。

youdao

Some of the rivers named in their club title, proclaimed on their jackets, have been polluted by red sludge.

BBC: Villagers despair in Hungary's red wasteland

The company has said the incident was a "natural catastrophe" and insists on its website that the red sludge is not considered toxic waste according to European Union safety standards.

BBC: The company behind Hungary's toxic spill

Around 150 people were injured, with many receiving burns, by the spill of up to 700, 000 cubic metres (24.7m cu ft) of red toxic sludge.

BBC: Hungary builds wall to slow possible new sludge wave