| Expression | 他从事于物理研究／这一课题许多年了。 |
|---|---|
| Meaning | He has worked at physics/the topic for many years. |
| Reading | tā cóng shì yú wù lǐ yán jiū／ zhè yī kè tí xǔ duō nián le。 |
Tags: hsk4-limited5-part2
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