Those factors, along with root expansion from growing trees, are common causes of structural collapse.
这些因素加上树木生长所致树根的蔓延，成为了建筑倒塌的一般原因。
According to the experiment of growing blood wood seedling by cuttimg, the main factors that influence the heigh, the length of root and the number of roots of blood wood seedlings are different.
根据扦插育苗试验表明，影响泰国赤桉苗高、根长及发根数的主要因素各不相同。
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