This " endogenous " process expands the economy 's balance sheet and boosts asset prices .
这种“内源性”过程使整体经济的资产负债规模扩大，并推动资产价格上涨。
The human genome , for example , is thought to owe some 8 percent of its code to endogenous retroviruses .
举个例子来说，人类基因代码有大约8%属于内源性的逆转录病毒。
However , circumstantial evidence suggests that rodents ( in the form of mice ) and primates ( in the form of both monkeys and humans ) have also acquired endogenous retroviruses that help placenta formation , and have done so independently of what happened in sheep .
By contrast with europe up to the 19th century , births exceed deaths in most , if not all , urban agglomerations today . Consequently , many urban centers now show endogenous growth , in addition to growth by immigration from the countryside .
