two-tier board英 [tuː tɪə(r) bɔːd]美 [tuː tɪr bɔːrd]网络 采用双层董事会; 双层制; 双层董事会; 二层论; 两层论经济双语例句Two-tier Employees 'Compensation Assessment Board system两级制雇员补偿评估委员会制度