慢速英语:North Korea Says It Tested Hydrogen Bomb

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collision – n. a crash in which two or more things or people hit each other

condemn – v. to say in a strong and definite way that someone or something is bad or wrong

fission – n. a process in which the nucleus of a heavy atom is split apart

fusion – n. a process in which the nuclei of atoms are joined

nucleus – n. the central part of an atom that is made up of protons and neutrons

provoke – v. to cause (a person or animal) to become angry, violent, etc.

tolerate – v. to allow (something that is bad, unpleasant, etc.) to exist, happen, or be done