查询词典 once in a blue moon

This is a chance once in the blue moon.

这是个难得的机会。

A It was something that happens once in the blue moon.

这是千载难逢的事。

There is a chance once in blue moon.

这是个难得的机会。

I haven't seen you once in a blue moon.

我很久没见到你了。

Similarly, items you only use once in a blue moon can be shared among neighbors, from ice cream makers to pruning shears, saving everybody plenty.

相类似的，你偶尔用过一次的东西也可以和邻居分享，从冰激淋机到修枝机，都能为每个人省一大笔钱。

Charlie dances with Fenny only once in a blue moon.

一字槽螺钉的旋具。第1部分：手动或者机动旋具工作部

We will see more and more activist government policies that distinguish economic activities according to the nationality of the actors.

我们将看到越来越多激进的政府政策，这些政策根据企业的国籍来区分经济活动。

If we can prove the independence of an axiomatic system, then we can guarantee the conciseness of this system, ie.

如果能够证明某个一阶谓词系统的独立性，那么就能够保证该系统的建立是精炼的，即没有任何一条公理或推理规则是多余的。