Once language starts to developfrom 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.
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。
2
This may developfrom our ancestors' need to run on the wet ground.
这可能源于我们的祖先需要在潮湿的地面奔跑。
3
How would you like the text (design, site...) to developfrom here?