bell jar
noun
1- a bell-shaped glass cover used in a laboratory, typically for enclosing samples（尤指实验室用来罩住样品的）钟形玻璃罩。
1.1
- figurative an environment in which someone is protected or cut off from the outside world〈喻〉与世隔绝的安乐窝, 世外桃源。
- ORIGIN: with allusion to Sylvia Plath's novel, The Bell Jar (1963).