| 研究HSK 4 | yán jiū | research; a study; Classifiers: 项 ; to research; to look into | |
| 究竟HSK 4 | jiū jìng | to go to the bottom of a matter; after all; when all is said and done; (in an interrogative sentence) finally; outcome; result | |
| 追究HSK 6 | zhuī jiū | to investigate; to look into | |
| 研究所HSK 5 | yán jiū suǒ | research institute; graduate studies; graduate school; Classifiers: 个 | |
| 研究生 | yán jiū shēng | graduate student; postgraduate student; research student |
| 1 | This issue requires in-depth research. | |
| 2 | This topic requires thorough research. | |
| 3 | Which country are you exactly from? | |
| 4 | I enjoy studying the cultures of different countries. | |
| 5 | His research lasted for three years. |