a pin with a point bent back towards the head, that is covered when closed so that it cannot hurt you 安全别针 
Can I borrow a safety pin? My button’s come off and I need something to hold my shirt closed. 我可以借用安全别针吗？我的纽扣脱落了，我需要一些东西来关闭衬衫。 Fasten the baby’s nappy with a safety pin. 用安全别针别好婴儿的尿布。
