“向东北”常见的英文表达是 “northeastward”(副词形式)或 “toward(s) the northeast” 。
northeastward 较为正式、书面,例如:The ship sailed northeastward.(船向东北航行。)
toward(s) the northeast 使用更普遍、自然,toward 用于美式英语,towards 用于英式英语,例如:We are moving toward(s) the northeast.(我们正朝东北方向移动。 )