reef-knot (US square-knot)

n type of symmetrical double-knot that will not slip or come undone easily 平结, 方结（对称的双结, 不容易滑脱或松开）.

redoubt, redoubtable, redound, redress, redskin, reduce, reduce to, reducible, reductio ad absurdum, reduction, redundancy, redundant, redundantly, reduplicate, reduplication, redwood, reed, reediness, reedy, reef, reefer, reek, reel, reenact, reeve, reexamine, reexport, ref, reface, refectory, refer, refer oneself to, refer to, refer to ...as, refer to sb. as, refer to...as, referable, referee, reference, reference book,