refractoryとは何ですか？
refractoryとは何ですか？
- Obstinately resistant to authority or control. See Synonyms at unruly.
- Difficult to melt or work; resistant to heat: a refractory material such as silica.
- Resistant to treatment: a refractory case of acne.
- One that is refractory.
- Material that has a high melting point.