Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
可以不用PLUS嘛？如果不可以，那我可不可以自己出钱如何升级一下呢？
https://singtown.com/learn/50918/
可以用目标点，来标注口罩。