The results showed that PELA is a new biodegradable copolymer.

结果表明PELA是一种新型生物降解材料。

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The egg hatching of Ericerus pela is affected mainly by temperature. Humidity and light have little influence on hatching.

白蜡虫卵孵化主要受温度的影响，湿度和光照对其孵化行为影响不大。

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Desde 2000, a pobreza extrema caiu pela metade.

UNESCO: Mensagem sobre o Dia Internacional para a Erradica??o da Pobreza

Priscilla Cruz, a campaigner for education reform from Todos Pela Educacao, sums up the challenge like this: "The political issue is that teachers are voters, and in Brazil there are two million of them that can decide elections, so it is very hard to make changes".

BBC: Booming Brazil held back by education gap