生长在西科罗拉多州埃尔克山脉中的颤杨，其叶子会在微风中颤抖，在北美非常普遍。
Quaking aspens like these in the Elk Mountains of western Colorado, whose leaves tremble in the slightest wind, are common across North America.
杨庄组在整个中、新元古界剖面中厚度不大，但其岩石类型多样且成因特殊。
The thickness of Yangzhuang Formation is small compared with the whole Proterozoic section, but it has multiple types of rocks with special origins.
该文以湘中杨市镇清代大宅民居为研究对象，结合实地测绘调查和文献阅读对其进行专项研究。
Taking Dazhai residences as the study subject , linking with on-the-spot mapping materials and historical literature to study .
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