sector

n.(尤指商业或贸易)部门；扇形面

secret agent (also agent), secret police, secret service, secretarial, secretariat, secretary, Secretary of State, Secretary-General, secrete, secretion, secretive, secretively, secretiveness, secretly, sect, sectarian, sectarianism, section, sectional, sectionalism, secular, secularism, secularist, secularize, secularise, secure, securely, securities, security, security guard, security risk, sedan, sedate, sedately, sedateness, sedation, sedative, sedentary, sedge, sedgy, sediment,