他们继续前行用英语可以表达为 "They continue on their journey"。这个短语的来源可能源于人们在进行旅行时继续前进的行为。
例如：
They continue on their journey, despite the challenges they face. 他们继续前行，尽管面临着挑战。
After a long day of travel, they were tired but determined to continue on their journey. 经过一整天的旅行，他们很疲惫，但决心继续前行。
They looked back at where they had come from, but quickly turned their attention back to the road ahead as they continued on their journey. 他们回头看了看自己来的地方，但很快就将注意力转回了前方的路，继续前行。