Today the painting is kept in the National Gallery in London.

今天，这幅画保存在伦敦的国家美术馆。

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People give blood to the centers, where it is kept until it is needed for medical purposes.

人们向中心机构献血，直到医疗需要前，这些血会一直贮存在机构里。

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Usually, if the tea is made in a teacup, boiling water should be added into the cup when half of the tea in it has been consumed; and thus the cup is kept filled and the tea retains the same bouquet.

通常，若是用茶杯泡的茶，在茶喝完一半之后就应该加开水，这样，茶杯就一直都是满的，茶的芳香也得以保留。

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The book is kept by the Library of Congress and has never been used at another swearing-in.

VOA: special.2009.01.19

This is an example where the external pressure here is kept fixed as the volume changes, but it doesn't have to be kept fixed.

在我们举的这个例子中,外界压强不变，气体体积改变。

麻省理工公开课 - 热力学与动力学课程节选

making sure that, you know, the building is kept up, building is safe and maintained,

确保宿舍楼内的安全和秩序。

关于宿舍制度 - SpeakingMax英语口语达人

At Idrees Ahmed's farm on the outskirts of Lahore, Sandy is kept in an air-conditioned den.

BBC: Nawaz Sharif party tiger 'alive and well'

The chemical is kept pressurized as part of the cooling system in meat processing plants.

NPR: Fire Kills 119 At Poultry Plant In Northeast China

If the minimum wage is kept to a reasonable level, it can be a good idea.

FORBES: Though Income Can't Be Legislated, Obama's Minimum Wage Hike Is Not A Bad Idea