regular

a.定期的，有规律的；正规的；匀称的

registered post, registered trade mark, registrar, registration, registration number, registry, registry office (also `register office), Regius professor, regnant (often 常作 Regnant), regress, regression, regressive, regret, regretful, regretfully, regrettable, regrettably, regroup, regrow, Regt, regularity, regularization, regularisation, regularize, regularize, regularise, regularly, regulate, regulation, regulator, regulatory, regurgitate, regurgitation, rehabilitate, rehabilitation, rehabilitative, rehash, rehear, rehearing, rehearsal, rehearse, rehouse,