一旦语言从2岁左右开始发展,他们就有了一个符号表征系统,可以谈论过去和现在环境之外的事情。
Once language starts to develop from about age 2, they do have a system for symbolic representation and can talk about things which aren't in their immediate environment including the past.
即使是一个生态效率高得多的工业系统,如果它发展得更大,也会比更小、更不生态效率的经济产生更多的垃圾,破坏更多的栖息地和物种。
Even a vastly more ecoefficient industrial system could, were it to grow much larger, generate more total waste and destroy more habitat and species than would a smaller, less ecoefficient economy.
一个高效而可持续发展的交通系统的创建是非常重要的。
The creation of an efficient and sustainable transport system is critical.
Well, one reason is that there are developmental disorders that seem to involve damage to one system but not to another.
一个原因是,发展障碍看上去,只会对某一个系统产生损害,而不会损害其他系统
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