1. This watch strap is made of vulcanite, which is known for its durability and flexibility.
这个手表表带是由硬橡胶制成的，以其耐用性和灵活性而闻名。

2. The vulcanite insulation on the electrical wires helps prevent electrical shocks and short circuits.
电线上的硬橡胶绝缘层有助于防止电击和短路。