The teacher clucked sympathetically at the child's story.对那小孩讲述的遭遇，老师啧啧地表示同情。Ducks clucked under the docks with a ducker in duck ducking into the dark.鸭子在码头下面咯咯叫,养鸭人一弯腰隐入黑暗中。Chickens clucked in the garden.鸡在花园里咯咯叫。T...
不要靠近那个变压器.Keep away from the transformer.变压器可在两个晶体管之间隔离直流 偏压.The transformer isolates the transistors with regard to d - c bias voltage .降压变压器 的匝数比小于1.A step - down transformer has a turns ratio less than 1....