It should be short and snappy, and no more than about 40 characters long (the width of a single column of text on a standard Economist page).

要求简短而上口，并且不能超过40个字(标准《经济学人》页面一栏内容所占宽度)。

youdao

It should be short and snappy, and no more than about 30 characters long (the width of a single column of text on a standard Economist page, including Spaces).

要求简短而上口，并且不能超过30个字(标准《经济学人》页面一栏内容所占宽度，包括空格)。

youdao