First, they exposed three tubes of chrome yellow to UV radiation until one turned a chocolate color.

首先，他们将三管铬黄曝露在紫外线辐射中，直到其中一管变成巧克力色。

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Analyses the variation of ice storage volume around the three tubes under the effect of water density inversion.

研究了密度反转和等间距三管间相互作用下，围绕上、中、下三管外蓄冰过程蓄冰量的变化规律。

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Conclusions "Three tubes technique" is a preferable therapy for patients with spontaneous esophageal rupture and the careful nursing is beneficial to the recovery of patients.

结论“三管法”是保守治疗自发性食管破裂良好的方法，精心护理有利于患者早日康复。

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The tubes are about three nanometres in diameter and six nanometres long.

ECONOMIST: Nanotechnology in biology

Three-quarters claim to brush their teeth twice a day, squeezing out an average of four toothpaste tubes a year, against three in Britain.

ECONOMIST: France��s bathroom blues

Dr Smith has bred about 3, 000 spiders in her kitchen in individual test tubes until they were three months old.

BBC: Rare fen raft spiders breeding in Suffolk