Step by step, he rose from one important task to another, until he became one of the best soldiers of that time.

一步一步地，他从做一个重要的任务上升到做另一个重要的任务，直到他成为当时最好的士兵之一。

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He was given an important task.

他被委以重任。

《新英汉大辞典》

"The task of further reductions of strategic offensive weapons is too important, both for Russia and the United States, and for the entire world in fact, to make it hostage of any particular regime anywhere around the globe.

VOA: standard.2009.05.07

Perhaps Tobin's most important task was to heal Boston Scientific's ailing cardiac stent business.

FORBES: Magazine Article

Even the opposition admitted that Mr Bumpers was a good choice for this important task.

BBC: President Clinton's best defence

UBS, the most important task is to save its franchise as a world-beating wealth manager.

ECONOMIST: Face value