Once language starts to develop from about age 2, they do have a system for symbolicrepresentation 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
Ts subcommand to translate the address to the symbolicrepresentation.
ts子命令将地址转换为符号表示。
3
Until the 1960s, symbolicrepresentation of language was thought to be uniquely human.