合成橡胶不具有子午线轮胎的那种强度，只有天然橡胶才具有所需的那种强度。
Synthetic rubber did not have the strength for radials; only natural rubber could provide the required sturdiness.
绝缘层一般为纯天然橡胶，铜丝为无氧铜，这样，才能保证线芯的良好导电性及电缆的安全性。
The insulating layer is pure natural rubber, copper wire for copper, so, in order to ensure the safety of wire and cable of good conductivity.
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