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1.The head of the National Aeronautics and Space Administration, or NASA, said that the space agency is on track to land people on Mars in the 2030s.
on track to 在 ... 的轨道上，即将做某事
China's reserves alone are on track to top $ 1, 000 bn within weeks.
仅中国的外汇储备，就可能在数周内突破1万亿美元。
Officials say the country is on track to achieve this.
中国官员表示正按计划进行并将达成目标。
2.It is already known that at one point in time Mars had conditions that could have supported life.
at one point 一度；在某处；在某一时刻
At one point a bird trilled in the Conservatory.
有那么一刻，一只鸟儿在温室里啼叫。
At one point last week shares in the grey market touched 230p.
上周，灰市上的股票价格一度高达230便士。
