He lolled at his ease, humming, not unmelodiously, snatches of a rude song, and fingering a pack of cards.
他懒洋洋地靠在那里，嘴里哼着一支不怎么悦耳的粗鲁的歌，手里拿着一副纸牌。
Once a male is settled, he's introduced to a female, and soon digs himself in to start humming his love song by vibrating his swim bladder—about a hundred times a second.
雄鱼一旦安顿下来，研究者会向它介绍雌鱼，它很快把自己埋入沙中，以大约每秒一百次的频率，振动自己的鱼鳔，借此来演唱情歌。
Once a male is settled, he's introduced to a female, and soon digs himself in to start humming his love song by vibrating his swim bladder—about a hundred times a second.
雄鱼一旦安顿下来，研究者会向它介绍雌鱼，它很快把自己埋入沙中，以大约每秒一百次的频率，振动自己的鱼鳔，借此来演唱情歌。
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