形容詞 bit by bit:

1. one thing at a time
   同義詞：bit-by-bit, in small stages, piecemeal, step-by-step, stepwise

副詞 bit by bit:

1. a little bit at a time
   同義詞：piecemeal, little by little, in stages
2. in a gradual manner
   同義詞：gradually, step by step

1. He saved money bit by bit until he have enough to buy a car.
   他一點兒一點兒攢錢直到夠買一輛汽車。
2. He saved money bit by bit until he had enough to buy a car.
   他一點兒一點兒攢錢直到夠買一輛汽車。
3. He assembled the model aircraft bit by bit.
   他一塊一塊地裝配飛機模型。
4. She committed six new$100 bills to the hands of her parents and asked them to let her have the money back, bit by bit, as she needed it.
   她將6張面額為100美元的新鈔交給父母保管，囑咐他們在她需要錢時，分期分批地交還與她。