科学家 + 们
科学家 (kēxuéjiā) is a noun meaning "scientist." It is formed by combining 科学 (science) with the suffix 家 (expert/specialist). For example, 科学家们 means "scientists."
很多科学家一辈子都在做基础研究。
Hěn duō kēxuéjiā yībèizi dōu zài zuò jīchǔ yánjiū.
Many scientists spend their entire lives doing basic research.
她的梦想是成为一名科学家。
Tā de mèngxiǎng shì chéngwéi yī míng kēxuéjiā.
Her dream is to become a scientist.
科学家们发现了一颗新的行星。
Kēxuéjiāmen fāxiànle yī kē xīn de xíngxīng.
Scientists have discovered a new planet.