If, after reading the advice in the section above, you're worried about a superheating accident when you try to boil water, don't worry — there's more you can do to keep yourself safe. For instance, perhaps the single biggest thing you can do to avoid the risk of superheated water is to not heat it for long periods of time. If your water isn't heated past its boiling point, it can't become superheated. The exact amount of time you'll want to limit your heating sessions to can vary based on the strength of your microwave. To be safe, try limiting your heating to a single one-minute segment at first. Based on how hot the water gets from this first heating attempt, you can adjust your next one accordingly. For the same reason that it it's a good idea to add something non-metallic to your water or to use a container with scratches in it, it's a bad idea to use perfectly smooth containers. Examples of these can often include new, pristine glass and ceramic bowls, though a variety of other materials can also be smooth enough to cause problems. Instead, use an older, more worn container or one with visible scratches at the bottom — these will create nucleation sites for bubbles to form. This may seem like it goes without saying, but it's important not to put your face anywhere near water that you think may have even a tiny risk of being superheated. Most injuries from superheated water result when a person removes the water from the microwave and looks into the container — a sudden burst of superheated water at this point can cause serious burns on the face and even permanent vision damage in the worst of cases.

TL;DR in Chinese:
加热水的时间不要太长。 避免使用太光滑的容器。 在确定水是安全的之前，脸要远离容器。