by air

1.The transportation of goods by air costs a lot.

航输货物花费很高。

2.The cost of transmitting books by air is very high.

籍的费用很高。

3.Because all my vegetables are from U.S. by air. And this cuke is very nutrient and has a lot of vitamins.

因为我这里所有的蔬菜都是从美国过来的,且这个黄瓜营养丰富,富含各种维生素.