The line develops the theme of the hopeless lives of the seasonal workers by setting the lines in nighttime from dusk until dawn.
A theme is developed in a passage by the following means:
Key events,
How characters respond to situations may all relate to theme. They where made to work from morning (dusk) to night (dawn).
Therefore, the line develops the theme of the hopeless lives of the seasonal workers by setting the lines in nighttime from dusk until dawn.
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