Definition: something that is certain to happen Level: C1
成功并非必然；它需要努力。
Success isn't ___a ___sure ___thing; it requires hard work.
在目前的经济形势下，找到一份稳定的工作已不再是板上钉钉的事。
In the current economy, finding a stable job is no longer ___a ___sure ___thing.
在科技股领域，快速增长曾被认为是必然之事。
In tech stocks, rapid growth was once considered ___a ___sure ___thing.
