短语
中文翻译：Unknown
同义词：
['on time', 'in order', 'on target']
例句：
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1.We need to be on the mark when we arrive at the airport.
当我们到达机场时，我们需要准时。
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2. The project is on the mark, but there's still room for improvement.
这个项目做得很好，但还有改进的空间。
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3. He was on the mark with his predictions about the economy.
他对经济预测的把握非常准确。