So at top left we have a slash and a star - and that says everything that follows that — those symbols is just a comment.

在左上角，大家可以看到，这是用来告诉大家，所有跟在它后面的-，标记都只是注释而已。

youdao

Enter a comment to negate the if (largestCityPopulationSB == null) statement by adding two forward-slash marks: //.

通过添加两个斜杠标记，输入注释取消 (largestCityPopulationSB ==null) 判断语句： //.

youdao

Enter a comment to negate the if (largestCityPopulationSB == null) statement by adding two forward-slash marks: //.

通过添加两个斜杠标记，输入注释取消 (largestCityPopulationSB ==null) 判断语句： //.

youdao