与海洋生境不同的是,淡水生境的环境条件变化很大。
The environmental conditions of freshwater habitats, unlike those of ocean habitats, are highly variable.
当环境条件变化时,这些材料就会找到一种新的理想形态。
When the conditions of the environment change, the material finds a new ideal form.
内部有效性——在条件变化的时候,其成因和结果还会是真实的么?
Internal validity - is there true cause and effect between variables.
This is the condition for really the lion's share of chemistry, biology, and other kinds of changes we'll be concerned with.
这就是绝大部分,生物变化,化学变化,和其他变化所关心的条件。
Whereas under these conditions, these quantities, if you look at free energy change, for example at constant temperature and pressure, H you can still calculate H.
但是,在这些条件下,这些物理量,如果我们考察自由能的变化,例如在恒定的温度和压强下,我们仍然可以计算。
This normal weight animal like this has its whole equilibrium thrown off, its homeostasis thrown off when its dietary conditions change.
在饮食条件发生变化时,这些正常体重动物的生理平衡被打破,于是摈弃了原来的平衡饮食
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