bb rabbit 兔 [Card #1; 字卡第1張: 第1個單字, 字母組合發音 bb]
bb = /b/(2個相同子音在一起, 只發一個音)

Some more examples(更多例字):babble, dabble, pebble, kibble, nibble, quibble, dribble, scribble, squabble, cobble, gobble, hobble, wobble, bobble, bubble, rubble, stubble, ebb, abbey, shabby, hobby, lobby, chubby, grubby, hubbub, cabbage, stubborn, ribbon, rubber, rubbish, gibberish, clobber, flabbergast