threeleaf三叶threenum.三n.三；三个adj.三个的three kind rate meter三种费率计算器three-tones dialect三声调方言three-index symbols三指标符号three color kinescope三色显象管three-toed sloth.有三趾的树獭。three conductor cable三芯电缆three position signal三相信号机three-level control三态调节three-handed bridge三人桥牌three kinds of beauty三美