优点：耐磨性佳、防滑、有弹性、不易断裂、柔软度较好、伸延性好、收缩稳定、硬度佳、弯曲性好。
Advantages: good abrasion resistance, anti slip, elasticity, not easy to break, softness, good stability, extended contraction, good hardness, good bending.
S4的出现意味着心房收缩好，房性纤颤病人无S4。
The presence of an S4 implies effective atrial contraction; it is never heard in atrial fibrillation.
它具有机械强度高、韧性好、耐热好及低收缩性、固化性好等特点。
It has high mechanical strength, toughness, good heat resistance and low shrinkage, good curing characteristics.
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