regulator

n device that regulates, esp the time 调节器; （尤指）整时器: a pressure, temperature, etc regulator 压力、 温度等调节器.

regnant (often 常作 Regnant), regress, regression, regressive, regret, regretful, regretfully, regrettable, regrettably, regroup, regrow, Regt, regular, regularity, regularization, regularisation, regularize, regularize, regularise, regularly, regulate, regulation, regulatory, regurgitate, regurgitation, rehabilitate, rehabilitation, rehabilitative, rehash, rehear, rehearing, rehearsal, rehearse, rehouse, Reich, reign, reigning, reimburse, reimbursement, rein, reincarnate, reincarnation,