hard black

A hard black form of lignite that takes a brilliant polish and is used in jewellery or ornamentation.

一种黑色硬质的褐煤，表面亮滑，用于珠宝和装饰。

A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder.

一种三价非金属元素，或呈坚硬的黑色晶体状，或呈黄色或棕色粉末状。

A fortnight later, when the snow had gone, and had been followed by a hard black frost, she took advantage of the state of the roads to try the experiment.

两个礼拜以后，风雪过去了，接着又是一场严酷的霜冻，她就利用道路冻住了的时候去进行这次拜访。

Ebony is a hard black wood.

黑檀树种黑而坚硬树木。

Germans had hard black bread and, if lucky, sausage and butter.

德国人则是黑硬型面包，如果运气够好，会有香肠和黄油。