单词：safety pin
safety pin的用法和样例：
例句
- The teen used a safety pin to help him escape.少年借助安全别针从而使自己逃脱。
- Something,such as a safety pin,that resembles such a piece of wire in shape or use.别针象安全别针这样的东西，外形或用途类似一根铁丝。
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