| Expression | 大气中如果没有氧和氮，人就无法生存于地球了。 |
|---|---|
| Meaning | If it were not for oxygen and nitrogen in the air, no man could live on the earth. |
| Reading | dà qì zhòng rú guǒ méi yǒu yǎng huò dàn， rén jiù wú fǎ shēng cún yú dì qiú le。 |
Tags: hsk4-limited4-part4
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