| 21. | The partnership can be a stepping stone to full NATO membership.
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| 22. | Each served as a stepping stone toward fostering his musical ambitions.
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| 23. | It looks like another stepping stone forward in joint operations here.
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| 24. | Hopefully, this will be a stepping stone and I can improve.
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| 25. | The hybrid vehicles are a stepping stone to the fuel cell.
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| 26. | But it is also a stepping stone to a better future.
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| 27. | Such a deal is considered a stepping stone to WTO membership.
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| 28. | Active participation is seen as a stepping stone into full membership.
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| 29. | The Olympics are only a stepping stone in his grand plan.
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| 30. | For most astronauts, NASA is a stepping stone to other things.
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