RAPPn.航空挂号邮包
rapn.轻敲;拍击;责骂;厉声说出;说唱音乐;谈话;最少量vi.轻敲;表演说唱音乐;畅谈
rap out a complaint.尖锐地说出埋怨之词
rapamune see rapamycin雷帕霉素, 纳巴霉素
Raphiolepia lanceolatan.细叶石斑木
raphe corporis callosi[医] 胼胝体缝
"The ascent was easy--roping down the mountain would be much more difficult and dangerous"
"You have to learn how to abseil when you want to do technical climbing"