trill

v [I, Ip, Tn] 1 sound or sing (a musical note) with a trill 用颤音发声; 用颤音唱（某乐音）: The canary was trilling away in its cage. 那只金丝雀在笼中鸣啭. 2 pronounce (a letter) with a trill 用颤音发（某字母）的音; 发某字母的颤音.

tricycle, trident, tried, triennial, triennially, trier, trifle, trifler, trifling, trigger, trigger-happy, triglyceride, trigonometric, trigonometrical, trigonometrically, trigonometry, trike, trilateral, trilaterally, trilby, trilingual, trillion, trillionth, trilobite, trilogy, trim, trimaran, trimmer, trimming, trinitrotoluene, trinity, Trinity Sunday, trinket, trio, trip, trip sb. up, trip-wire, tripartite, tripe, triple, triplet,