The vacuumflask has a strong casing, which won't crack or chip.
这个真空瓶有一个坚固的外壳，不会破裂。
《柯林斯英汉双解大词典》
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How it got here: Scottish chemist and physicist Sir James Dewar invented the vacuumflask Iin 1892 as a way to keep liquid nitrogen from warming up and turning into gas in his lab.