叙利亚，俄罗斯指责美国谎报化学武器袭击

source – n. someone or something that provides what is needed

allegation – n. a claim or accusation

unverified – adj. unconfirmed

regime – n. a form of government

commitment – n. a promise to do or give something

abstain – v. to choose not to do or have something

minimum – n. the lowest in a set of numbers; the smallest amount

restraint – n. control over one's behavior

opportunity – n. a chance of progress or forward movement