灰色的

It showed that residual heavy metal content in the smelting residue was still high. Although the lixivium toxicity declined over a long period, the acute toxicity hazard still exists.

说明古冶炼废重金属含量依然很高，虽然经长时间风化淋滤其浸出毒性降低，但是急性毒性危害仍然存在。

Little Women and Alcott's other domestic novels have enjoyed more popularity than her novels of other genres.

小妇人和阿尔科特的其他国内小说有着更受欢迎比她的小说中的其他类型。