求翻译：农业有三要素，劳动力，劳动工具，劳动对象。我这边文章就围绕着三方面写的，而时间定在美国西进运动时期。因为这一时期是美国农业历史上转折期之一。这一时期正好经历了美国小农经营向资本主义农业过度时期，各种变化具有典型性代表性。关于劳动的数量质量，劳动工具的先进程度，劳动对象的变化都是我要了解的内容。我们需要正确的认识那时候美国农业的发展过程，它为美国发展提供了便利条件，但同时它也是伴随着新进运动而进行的，同时，西进运动是美国的的一部血泪史。所以，不光要研究它的表面的现象，还要深入挖掘它内部的东西。是什么意思？

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Agriculture has 3 elements, and the labor and instrument of labor, labor. I am here to articles written in around 3, and the time in the United States during the campaign. As this period is a turning point in history the US agriculture. This period is just going through the United States Small Busin

Three elements of agriculture, labor, labor, subject of labor. Write articles here I will focus on the three areas, and the time in the United States during the westward movement. Because this period is the United States one of the turning point in the history of agriculture. Experienced during this