by plane:乘飞机——固定用法,对飞机没有具体所指。通常指人乘坐飞机。与by air意思基本相同。
例如:
For most of these towns, the only way to travel or receive mail and supplies is by plane, called “bush planes”. 在大多数内陆城镇,唯一的旅行,接收邮件和运送供给品的方式是飞机,即所谓的“丛林飞机”。
by a plane:由某一架飞机(具体指某一架飞机)
例如:
1、By contrast a rocket lifted by a plane with wings before being launched can be made much smaller and lighter. 相反在发射前,由飞机搭入空中的火箭可以轻许多、小许多。
2.Ali says he does not know who was in the house or who carried out the attack, but he says residents believe it was a bomb dropped by a plane, seen flying over the town in recent days. 阿里说,他不知道房屋内有什么人,也不知道谁发动了袭击,但是他说,居民们认为是飞机上扔下一枚炸弹,人们看到这架飞机最近在城镇上空盘旋。
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