我在这里并不是要为里克·佩里站台，不过他说的显然是真理：人口结构会发生改变，不可能每一代人都能从这个系统中拿到比自己所付出的还要多的钱。

I am not here to endorse candidate Rick Perry, but the point of his charge is obviously true: each generation can't keep taking more out of the system than it put in, once the demographics change.

youdao

他们提供的代码范围包括，从补丁到结构化的内核改变，从文件系统和国际化工作到GPL ' d驱动程序。

They contribute code ranging from patches to structural kernel changes; from file systems and internationalization work to GPL'd drivers.

youdao

在轻集料混凝土内，微观结构的改变，对混凝土性能的影响，目前还没有人做过系统的研究。

Inside lightweight aggregate concrete, no one has made systematical research on the change in microstructure to the influence of concrete property.

youdao