| Смех девушки долго звучал в его ушах. | The girl's laughter rang in his ears for a long time. |
| Её смех заразил всех. | Her laughter infected everyone. |
NB When the word смех functions as a subject and does not have a descriptive modifier, the construction смех у + Genitive is often preferred to (a) and (b), above: | |
| Смех у девушки был звонкий и заразительный. | The girl had a ringing and infectious laugh. |