Preparations from the white mustard plant ("Sinapis alba") have a less pungent flavor than preparations of Brassica nigra.

白芥末植物的制剂比黑芥子的制剂刺激性较小。

Porta Nigra of Trier. Another view.

特里尔的古罗马城门。另一角度。

This area is called the substantial nigra.

这部分区域被称为是黑质细胞。

Study on the Aboveland Parts Growth Law of Juglans nigra Seedling;

采用组织培养方法对美国黑核桃进行组织培养研究。

Brassica alba yields white mustard seeds; Brassica nigra, black mustard seeds.

白质芸苔生产白色芥茉籽，黑质芸苔生产黑色芥茉籽。