The swiss-based international union for conservation of nature , an environmental lobby , which publishes a " red list " of the world 's most endangered species , says elephants in southern africa are increasing by 4 % a year . Their fecundity is offsetting losses in central and west africa .
After the world wars , europe never regained this fecundity .
世界大战之后,欧洲再也没有恢复这种繁殖力。
Fecundity and frustration sum up the state of brazil these days .
富饶和困惑,是现在巴西这个国家的写照。
In the worst places , fecundity tends to track instability .
在最惨的地方,越是动荡人们越是多产。
They set out to discover whether female competition accounted for these impressive armaments , and whether there was a trade-off between horns and fecundity .