log-rolling

n [U] (derog 贬 esp US) practice of helping others in return for their help, as when authors review each other's books favourably 相互吹棒, 相互标榜（如作家间互相作好评）.

locution, lode, lodestar (also loadstar), lodestone, lodge, lodgement (also lodgment), lodger, lodging, lodging-house, loess, loft, lofted, loftily, loftiness, lofty, log, log book, log cabin, log-book, log-jam, loganberry, logarithm, logarithmic, logarithmically, loggerheads, loggia, logging, logic, logical, logicality, logically, logician, logistic, logistical, logistically, logistics, logo, loin, loincloth, loiter, loiterer,