1N-COUNT [usually plural]青刀豆;四季豆String beans are long, very narrow green vegetables consisting of the cases that contain the seeds of a climbing plant. 青刀豆;四季豆 [US]
in BRIT, use 英国英语用 French beans
2N-COUNT [usually plural]红花菜豆String beans are vegetables similar to French beans, but thicker. 红花菜豆 [British]