on the wing

1.The birds are on the wing for warmer countries.

鸟儿展翅飞往较温暖的地方。

2.It was a lovely photograph of a bird on the wing.

这漂亮的飞行中的鸟的照片。

3.Mary's husband is a traveling salesman and he's always on the wing.

玛丽的丈夫个旅行推销员, 他总在旅行。