英语语法分析

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。