An economic transaction is an exchange of value.

We consider this invention as of vital importance.

我们认为这一建议缺乏实用价值.

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This matter is of vital importance to us.

这件事对我们来说至关重要.

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Simple keyboard shortcuts and mouseless operation will be of vital importance.

它应该具有简单的键盘快捷键并能脱离鼠标操作.

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For Citi, the case is of vital importance.

对于花旗而言, 此案事关重大.

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Internal pressure with a liquid-filled projectile is of vital importance in its reliability design.

装液弹弹内压力对弹的安全可靠性极其重要.

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The question put forward at the meeting is of vital importance.

会上提出的那些问题极其重要.

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This is of vital importance.

这是至关重要的.

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Therefore, it is of vital importance to improve appraisal system.

可见, 完善我国公务员绩效考核体系十分重要.

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Methodology of diplomatic investigation and study is of vital importance.

外交调研的方法论至关重要.

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This is of vital importance to the sustainable development of APEC members.

这对各成员的持续发展至关重要.

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She has an off and on pain in the stomach.

她的胃疼好一阵,坏一阵.

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He has been writing to us off and on for several years.

他断断续续地给我们写信已经有好几年了.

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We lived together, off and on, for two years.

我们断断续续在一起生活了两年。

《柯林斯高阶英汉双解学习词典》

It rained off and on all day.

断断续续下了一天雨.

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It was blowing and raining hard, off and on.

室外大风劲吹,大雨倾盆, 时断时续.

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He only accepted the primary education off and on in his childhood.

他小时候只断断续续地接受过初等教育.

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Perhaps secondhand cares, like second-hand clothes, come easily off and on.

或许二等角色的责任, 正如二道手的衣服一样, 穿上脱下都比较随便吧.

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Yahoo ! and Microsoft have been talking, off and on, since last year.

微软公司在网络业务上与谷歌的差距更远.

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They don't go there often, just off and on.

他们不常去那里, 只是偶尔去. .

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It rains off and on.

雨忽而下,忽而停.

《现代汉英综合大词典》