- 开滦角石属: kailuanoceras
- 开绿灯,准许做某事: give the green light
- 开卵器: egg opener
- 开绿灯: give the green light; give free rein; turn on the green light; give the go-ahead signal 我们永远不会给赌博开绿灯。 we'll never give the green light to gambling
- 开轮式: openwheeledd
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