These epithelial elements arise embryologically from foregut endoderm in the process of bronchial tubular growth.这些表皮细胞在胚胎学上把源于支气管生长过程中的前内脏叫内胚层.The mucous cells lie in the anterior part of the foregut and cloaca.粘液细胞分布于前...
狗摇尾巴以报答人们的爱护.A dog reacts to kindness by wagging its tail.那就是你报答我给予帮助的方式 吗 ?Is that how you reward me for my help?总有一天我会报答你对我的恩德.Some day I will reciprocate your kindness to me....