Northern winter indoor heating can be the normal construction, if the temperature does not guarantee a good idea to test a small area.

北方冬季室内有暖气可正常施工，如果温度不能保证，最好先进行小面积试验。

youdao

Some experts say one way to tell if a person is a supertaster is to count the number of papillae in a small area after dying the tongue with food coloring, a test that can be done at home.

WSJ: People Who Taste Too Much