duck/dʌk/发短音，dark/dɑːk/发长音。

The main course was roast duck.主菜是烤鸭。She chose a bench beside the duck pond and sat down.她选了鸭池旁的一张长椅坐了下来。Her eyes gleamed in the dark.她的眼睛在黑暗中闪烁。We should arrive before dark.我们天黑以前应该能赶到。One dark brow rose in surprise.一道乌黑的眉毛惊奇地挑起。