581. relieve…of… 解除,解脱;帮助拿,辞退

580. to one’s relief 令…感到放心的是

579. relevant to 与…有关的

578. inwith relation to 关于, 有关

577. regardless of (=without worrying about, despite, in spite of) 不顾,不考虑

576. give one’s regards to sb. 向…问候

575. within regard to (=concerning)有关,关于

574.within reference to(=concerning, about)关于

573. refer…to… (=send, take) 送交,呈交

572. refer to…as 把…称做…