在这种情况下，气体从一个特殊的喷嘴喷出，这种喷嘴两头较宽，越往当中越细。 In this case, the gases are pushed out through a special nozzle that is narrower toward the middle than at either end.
他把绳子的两头结在一起。 He knotted together the ends of the rope.
作为一名律师他每天工作已经很辛苦，而每天晚上他还出去参加晚会和舞会；他这是蜡烛两头点，大疲劳了。 He worked hard every day as a lawyer and went to parties and dance every night; he was burning the candle at both ends.
