Libration
n. 摆动, 天平动
🗣️ 情景例句
You don't need to do that, Grandpa.
你不用这样，爷爷。
Because of the warm and sunny weather,oranges grow very well here.
因为温暖和阳光充足的天气，橘子在这里成长很好。
but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home, feeding its flown young as it flies,
在空中十分自如，可以飞行6，000英里，可以飞往北方做窝的老家，再从老家飞回；一边飞一边喂养会飞的雏燕，甚至在顶风时也能在气流中滑翔，似乎气流在帮它前进。