《明史·列传·卷六十》
塞上诸军，防卫边疆劳苦，没有其它生计，惟有从事田耕。
塞上诸军，防边劳苦，无他生业，惟事田作。
The various troops on the border defend the frontiers and toil on the front lines, and they have no other means of making a living apart from cultivating the land.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 塞上诸军，防边劳苦，无他生业，惟事田作。 [/INST] The various troops on the border defend the frontiers and toil on the front lines, and they have no other means of making a living apart from cultivating the land.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 塞上诸军，防边劳苦，无他生业，惟事田作。
user
The various troops on the border defend the frontiers and toil on the front lines, and they have no other means of making a living apart from cultivating the land.
assistant