1)bell shaped valve,bell valve,cup washer,钟形阀2)The bell-shaped curving,钟形曲线3)bell distributed,钟形分布4)the bell box passage,钟形流道5)Bell nozzle,钟形喷管6)bell shaped magnetic lens,钟形磁场
用法和例句
For Glasser′s bell shaped magnetic lens, third , fifth , seventh , ninth order spheric aberrations have been analytically derived and numerically calculated.
