求翻译：比较图4(b)与图6，可以看出，对同一种谐振频率（为36.5kHz）、不同的阶梯材料（一者为铝合金，另一者为钢材料），指向性似乎无明显变化。这说明指向性与阶梯盘材料关系不大。是什么意思？

Comparing Figure 4 (b) and Figure 6, can be seen on the same resonant frequency (for 36.5kHz), a different ladder material (a person of aluminum, steel materials to another person), seems to point to no significant change of . This shows that the point of the disc material has little to do with the

Figure 4 (b) compared with Figure 6, as can be seen, the same resonant frequency (36.5 ), kHz materials (A different ladder for aluminum alloy steel material, and the other one is), point to appear to be no noticeable change. This illustrates that point to sexual and ladder up little relationship ma

Compared with Figure 4(b) with Figure 6, may see, to the identical kind of resonance frequency (is 36.5kHz), the different steps and ladders material (one is aluminum alloy, another one for steel material), the directive property as if changes not obviously.This indicated the directive property and

Figure 4 (b) and Figure 6, you can see that, on the same resonant frequency (36.5kHz), the ladder of different materials (yizhe for aluminum alloy, another yizhe steel materials), nature seems to be no obvious change. This shows links to material is not so much as the ladder disk.

Compare Figure 4 (b) fig 6, can see on resonant frequency (36.5kHz) ladder, different materials (yizhe for aluminum alloy, other steel materials), nature seems no obvious changes. This shows links to material is not so much as the ladder disk.