| Share | Phrase |
|---|
| 24.33% | multi-layered [structure] body |
| 17.44% | multi-layered [structure] bellow |
| 16.39% | multi-layered [structure] spring |
| 13.76% | multi-layered [structure] generator |
| 11.82% | multi-layered [structure] column |
| 10.36% | multi-layered [structure] tube |
| 5.86% | multi-layered [structure] structure |