art. (用于可数名词或单数名词前,表示未曾提到的)一(人、事、物);用于前有形容词或后有短语的不可数名词前;一(个);每一(个);任一(个);
例句:
She was invited to give a paper on the results of her research.
她应邀发表一篇论文,报告她的研究结果。
I'd like to learn a new language.
我想学习一门新的语言。
The poor man received a savage beating from the thugs.
那可怜的人遭到暴徒的痛打.