共 + Verb + Number + Measure Word + Noun
共 (gòng) means "in total" or "altogether" and is placed before a verb or number to indicate a cumulative sum. It is a concise alternative to 一共, commonly used in news and formal writing.
这次会议共有三十多个国家参加。
zhè cì huì yì gòng yǒu sān shí duō gè guó jiā cān jiā.
A total of more than thirty countries participated in this meeting.
我们班共来了五位新同学。
wǒ men bān gòng lái le wǔ wèi xīn tóng xué.
A total of five new classmates joined our class.
这个项目共花了两年时间才完成。
zhè gè xiàng mù gòng huā le liǎng nián shí jiān cái wán chéng.
This project took a total of two years to complete.