| 摘要 |
<p>According to one embodiment of the disclosure, an annular seal (20) generally includes a hollow member (30) having two ends (36) and an inner surface (32). The hollow member (30) has a number of depressions (38) formed in and extending around its inner surface (32). Each of the depressions (38) having a depth that is a function of its distance from one of the two ends.</p> |
