ActionScript also requires a reference to other packages (libraries) in order to use them; hence the "import" statement at the top of the Script block.

ActionScript在使用一个包(库)之前，先要进行引用，所以例中脚本块的开头有一行“ import ”语句。

youdao

She pointed out that the Children's Internet Protection Act already requires libraries to block net content that is harmful to children.

BBC: Many schools have already banned social network sites