One clue to the origin of the peculiar shape of glacial valleys is the mechanisms by which glaciers carve valleys . 探索冰川山谷的奇特形状起源的一种方法是研究冰川开凿山谷的机制。
There is a built-in mechanism that permits the population to respond to crowding or food shortage early enough . 存在着某种内在机制，它使得种群能足够早地对拥挤或食物不足作出反映。
Forest ecologists have been more concerned than agronomists with the inner mechanisms of natural and artificial ecosystems . 森林生态学家比农学家更关心天然生态系统和人工生态系统的内部机制。
Because there is so little known about the underlying defect in scleroderma or its pathogenesis, no specific treatment is available . 由于对硬皮病内在病损或发病机制了解极少，以致尚无特效治疗方法。
As a result of the increasing efficiency of the defense mechanism, the infection subsides or becomes latent for various periods of time . 由于防御机制效率的增加，感染可减轻或在不同时期呈潜伏状态。
Modern genetic mechanisms, including informational macromolecules have not always existed in their present form . 目前的信息大分子为中心的遗传机制，从历史的观点看不大可能一开始便以现存的形式见诸于世。
The mechanism of nutrient uptake by soybean roots is only part of a more general problem on the subject involving all plant species . 大豆根系对养分的吸收机制只是所有作物吸收养分的最一般问题的一部分。
The mechanism of shock formation apparently changes, too, at these altitudes so that the scaling laws are no longer applicable . 在这个高度下，冲击形成的机制也有很明显的改变，所以递增公式也就不再适用了。
These high mobilities are attributed to a special jumping mechanism that operates in addition to the usual motion through the solvent . 这种高淌度的原因是，除了一般通过溶剂的运动以外，还有特殊的跳跃机制在起作用。
The most likely and obvious radiative connection between the infrared and the masers is through the mechanism of radiative pumping of the maser . 红外辐射及微波激射间最可能而又明显的辐射联系是通过微波激射的辐射抽运机制实现的。
