Proctodone
后肠激素
🗣️ 情景例句
That's right.
对了。
Knowledge advances by steps and not by leaps.
知识只能循序渐进，不能跃进。
Early next morning, she heard planes passing overhead and wondered how she could send a signal.
第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。