Night hours in spring are extremely precious.

春宵一刻值千金。

《新英汉大辞典》

It is art in it's most transitory form. It is gone within an instant, and therefore, extremely precious.

它是最短暂的艺术形态，瞬间就会消失，因此，万分珍贵！

youdao

Hence, even an hour is extremely precious.

因此，哪怕是一小时也是极其宝贵的。

youdao

Precious is an extremely overweight black teenager in the Harlem area of New York City.

VOA: special.2010.03.01

Bielsa's team had one extremely rare and precious characteristic: wherever the game, whoever the opponents and whatever the circumstances, they were happy to accept the risks of taking the initiative.

BBC: Finals the poorer for Argentina exit

Museum director, Neil MacGregor, said the exhibition has been possible following a collaboration with the Archaeological Superintendency of Naples and Pompeii, "which has meant extremely generous loans of precious objects from their collections, some that have never travelled before".

BBC: British Museum to exhibit artefacts from buried cities

One wildly successful example is Gemvara where Matt Lauzon realized he did not need to keep precious stones in inventory but, instead, to show extremely realistic and tantalizing gem settings, with the software support that enables customers to design their jewelry.

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