a glass or plastic cover placed over young plants to protect them from cold weather （保护植物幼苗不受冻的）玻璃罩，塑料罩 
- (also cloche hat)
a woman’s hat that is like a bell in shape and fits close to the head, worn especially in the 1920s （尤指 20 世纪 20 年代的）钟形女帽
Word Originlate 19th cent.: from French, literally ‘bell’, from medieval Latin clocca ‘bell’.