Do you know the word "deuterium and tritium"

The words "deuterium and tritium" are pronounced as "π, 5piπ, which is one of the isotopes of hydrogen (H) with the symbol1H. It is not only a high-quality fuel, but also an important raw material of petroleum and natural gas, deuterium dāo, a stable radioactive element of hydrogen, also called heavy hydrogen. The symbol of the element is generally D or 2H, and its content in nature is about 7000 times that of general hydrogen, which is used for thermonuclear reactions. Tritium chuān, also known as "superheavy hydrogen", with symbol T or 3T, is radioactive and rarely exists in nature. It is made by nuclear reaction and is mainly used for thermonuclear reaction.